Rebooting every 4 hours

Mac Mini w/ Mavericks reboots every four hours like clockwork. We've reset SMC, unplugged backups, turned off Time Machine, checked for /etc/periodical maint. scripts.
Log files point to shutdown reason 5. We can't find what that means anywhere.
What would cause a machine to reboot like this?

I saw a similar unexplained reboot today on my MacBook Pro (10,1) running 10.9.3.
I found:
6/19/14 9:28:54.345 AM shutdown[755]: reboot by _atsserver:
It is possible that there is a shared API call in the atsserver and trustevaluationagent services which can initiate a failsafe reboot. This indicates that the atsserver and the trustevaluationagent services are not necessarily responsible for the reboot behavior.
I recommend registering as an Apple Developer (its free) and posting a bug at bugreport.apple.com. Include more console context, particularly earlier than you have above.
In my case, symptoms of system instability can be seen earlier in my console log:
6/19/14 9:28:53.704 AM com.apple.launchd[1]: (com.apple.WebKit.WebContent.95D7B71D-0E8F-4791-B594-9C1E4CA0A4E9[597]) Could not terminate job: 3: No such process
6/19/14 9:28:53.704 AM com.apple.launchd[1]: (com.apple.WebKit.WebContent.95D7B71D-0E8F-4791-B594-9C1E4CA0A4E9[597]) Using fallback option to terminate job...
6/19/14 9:28:53.704 AM com.apple.launchd[1]: (com.apple.WebKit.WebContent.5C065871-7058-470C-AD63-DD6C77FBB4BA[408]) Could not terminate job: 3: No such process
6/19/14 9:28:53.704 AM com.apple.launchd[1]: (com.apple.WebKit.WebContent.5C065871-7058-470C-AD63-DD6C77FBB4BA[408]) Using fallback option to terminate job...
6/19/14 9:28:53.704 AM com.apple.launchd[1]: (com.apple.WebKit.WebContent.45AF1C62-AB32-46D8-8056-4BD5B5E2F4A3[407]) Could not terminate job: 3: No such process
6/19/14 9:28:53.704 AM com.apple.launchd[1]: (com.apple.WebKit.WebContent.45AF1C62-AB32-46D8-8056-4BD5B5E2F4A3[407]) Using fallback option to terminate job...
6/19/14 9:28:53.704 AM com.apple.launchd[1]: (com.apple.WebKit.WebContent.CB40CFB2-B52D-48F9-9EA0-567E7FCBF840[406]) Could not terminate job: 3: No such process
6/19/14 9:28:53.704 AM com.apple.launchd[1]: (com.apple.WebKit.WebContent.CB40CFB2-B52D-48F9-9EA0-567E7FCBF840[406]) Using fallback option to terminate job...
6/19/14 9:28:53.714 AM com.apple.launchd[1]: (com.apple.WebKit.Networking.934CF6D4-8C34-4E5B-A580-C49AF13763E2[235]) Exited with code: 1
6/19/14 9:28:53.924 AM com.apple.launchd.peruser.501[156]: ([0x0-0xa00a].com.apple.Terminal[167]) Exited: Killed: 9
6/19/14 9:28:53.924 AM login[238]: DEAD_PROCESS: 238 ttys000
6/19/14 9:28:53.924 AM login[247]: DEAD_PROCESS: 247 ttys001
6/19/14 9:28:53.951 AM com.apple.launchd.peruser.501[156]: ([0x0-0x9009].com.apple.dt.Xcode[165]) Exited: Killed: 9
6/19/14 9:28:53.958 AM WindowServer[118]: CGXGetConnectionProperty: Invalid connection 69343
6/19/14 9:28:53.958 AM WindowServer[118]: CGXGetConnectionProperty: Invalid connection 69343
6/19/14 9:28:53.958 AM WindowServer[118]: CGXGetConnectionProperty: Invalid connection 69343
6/19/14 9:28:53.959 AM WindowServer[118]: CGXGetConnectionProperty: Invalid connection 69343
6/19/14 9:28:54.024 AM WindowServer[118]: CGXGetConnectionProperty: Invalid connection 59395
6/19/14 9:28:54.025 AM WindowServer[118]: CGXGetConnectionProperty: Invalid connection 59395
6/19/14 9:28:54.025 AM WindowServer[118]: CGXGetConnectionProperty: Invalid connection 59395
6/19/14 9:28:54.025 AM WindowServer[118]: CGXGetConnectionProperty: Invalid connection 59395
6/19/14 9:28:54.025 AM WindowServer[118]: CGXGetConnectionProperty: Invalid connection 59395
6/19/14 9:28:54.026 AM WindowServer[118]: CGXGetConnectionProperty: Invalid connection 59395
6/19/14 9:28:54.026 AM WindowServer[118]: CGXGetConnectionProperty: Invalid connection 59395
6/19/14 9:28:54.026 AM WindowServer[118]: CGXGetConnectionProperty: Invalid connection 59395
6/19/14 9:28:54.027 AM WindowServer[118]: CGXGetConnectionProperty: Invalid connection 59395
6/19/14 9:28:54.029 AM WindowServer[118]: CGXFilterEventToConnection : Invalid connection
6/19/14 9:28:54.033 AM WindowServer[118]: CGXFilterEventToConnection : Invalid connection
6/19/14 9:28:54.048 AM com.apple.launchd.peruser.501[156]: (com.apple.universalaccessAuthWarn[501]) Exited: Killed: 9
6/19/14 9:28:54.048 AM com.apple.launchd.peruser.501[156]: (com.apple.AirPlayUIAgent[472]) Exited: Killed: 9
6/19/14 9:28:54.051 AM com.apple.launchd.peruser.501[156]: (2BUA8C4S2C.com.agilebits.onepassword-osx-helper[435]) Exited: Killed: 9
6/19/14 9:28:54.055 AM com.apple.launchd[1]: (com.apple.ShareKitHelper[218]) Exited: Killed: 9
6/19/14 9:28:54.056 AM com.apple.launchd[1]: (com.apple.internetaccounts[227]) Exited: Killed: 9
6/19/14 9:28:54.058 AM com.apple.launchd.peruser.501[156]: ([0x0-0x25025].com.apple.AppleSpell[426]) Exited: Killed: 9
6/19/14 9:28:54.059 AM com.apple.launchd.peruser.501[156]: (com.apple.iTunesHelper.71840[457]) Exited with code: 1
6/19/14 9:28:54.065 AM WindowServer[118]: CGXSetWindowListSystemAlpha: Invalid window 127 (index 0/1)
6/19/14 9:28:54.131 AM sessionlogoutd[751]: sessionlogoutd Launched
6/19/14 9:28:54.141 AM sessionlogoutd[751]: DEAD_PROCESS: 83 console
6/19/14 9:28:54.154 AM com.apple.launchd.peruser.501[156]: (com.wacom.wacomtablet[449]) Exited with code: 1
6/19/14 9:28:54.223 AM com.apple.launchd.peruser.501[156]: (com.wacom.WacomTouchDriver.235168[464]) Exited with code: 1
6/19/14 9:28:54.254 AM Core Sync[531]: NSDistantObject (0x102017100) is invalid (no connection)
6/19/14 9:28:54.345 AM shutdown[755]: reboot by _atsserver:
6/19/14 9:28:54.345 AM shutdown[755]: SHUTDOWN_TIME: 1403195334 344842
6/19/14 9:28:54.000 AM kernel[0]: Kext loading now disabled.
6/19/14 9:28:54.000 AM kernel[0]: Kext unloading now disabled.
6/19/14 9:28:54.000 AM kernel[0]: Kext autounloading now disabled.
6/19/14 9:28:54.000 AM kernel[0]: Kernel requests now disabled.

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Product Information
Product Name:
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Serial Number:
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Hardware Version:
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MAC Address:
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Client Certificate:
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Open
System Status
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RTP Packets Sent:
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RTP Bytes Sent:
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RTP Packets Recv:
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RTP Bytes Recv:
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Please read this whole message before doing anything.
This procedure is a diagnostic test. It won’t solve your problem. Don’t be disappointed when you find that nothing has changed after you complete it.
Third-party system modifications are a common cause of usability problems. By a “system modification,” I mean software that affects the operation of other software — potentially for the worse. The following procedure will help identify which such modifications you've installed. Don’t be alarmed by the complexity of these instructions — they’re easy to carry out and won’t change anything on your Mac.
These steps are to be taken while booted in “normal” mode, not in safe mode. If you’re now running in safe mode, reboot as usual before continuing.
Below are instructions to enter some UNIX shell commands. The commands are harmless, but they must be entered exactly as given in order to work. If you have doubts about the safety of the procedure suggested here, search this site for other discussions in which it’s been followed without any report of ill effects.
Some of the commands will line-wrap or scroll in your browser, but each one is really just a single line, all of which must be selected. You can accomplish this easily by triple-clicking anywhere in the line. The whole line will highlight, and you can then copy it. The headings “Step 1” and so on are not part of the commands.
Note: If you have more than one user account, Step 2 must be taken as an administrator. Ordinarily that would be the user created automatically when you booted the system for the first time. The other steps should be taken as the user who has the problem, if different. Most personal Macs have only one user, and in that case this paragraph doesn’t apply.
Launch the Terminal application in any of the following ways:
☞ Enter the first few letters of its name into a Spotlight search. Select it in the results (it should be at the top.)
☞ In the Finder, select Go ▹ Utilities from the menu bar, or press the key combination shift-command-U. The application is in the folder that opens.
☞ Open LaunchPad. Click Utilities, then Terminal in the icon grid.
When you launch Terminal, a text window will open with a line already in it, ending either in a dollar sign (“$”) or a percent sign (“%”). If you get the percent sign, enter “sh” and press return. You should then get a new line ending in a dollar sign.
Step 1
Triple-click the line of text below to select it:
kextstat -kl | awk '!/com\.apple/{printf "%s %s\n", $6, $7}'
Copy the selected text to the Clipboard by pressing the key combination command-C. Then click anywhere in the Terminal window and paste (command-V). Post the lines of output (if any) that appear below what you just entered. You can do that by copying and pasting as well. Omit the final line ending in “$”. No typing is involved in this step.
Step 2
Repeat with this line:
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Step 3
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Step 5
osascript -e 'tell application "System Events" to get name of every login item' 2> /dev/null
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Time Machine window appears every hour

Every hour a pop-up window appears on my iMac as follows:
<Time Machine couldn’t complete the backup to “Time Machine - 2 TB”.
<The backup disk ran out of space unexpectedly. Time Machine will try to make <more space available by removing expired backups during the next scheduled <backup.
<Open Time Machine preferences to select a larger backup disk or make the backup <smaller by excluding files.
However, Time Machine does not remove expired backups. It repeats this message every hour.
This did not happen before I upgraded to Mountain Lion from Safari.
How do I fix this?

Please read this whole message before doing anything. This procedure is a diagnostic test. It’s unlikely to solve your problem. Don’t be disappointed when you find that nothing has changed after you complete it. The purpose of this exercise is to determine whether the problem is caused by third-party system modifications that load automatically at startup or login. Disconnect all wired peripherals except those needed for the test, and remove all aftermarket expansion cards. Boot in safe mode* and log in to the account with the problem. The instructions provided by Apple are as follows:
Shut down your computer, wait 30 seconds, and then hold down the shift key while pressing the power button.
When you see the gray Apple logo, release the shift key.
If you are prompted to log in, type your password, and then hold down the shift key again as you click Log in.
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Airport Extreme requests new IP almost every hour

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With my computer on, the AEBSn on, and the cable modem on, First, Unplug your cable modem. Wait 10 seconds and then plug it back in and wait for the lights to come back on (not sure what kind of modem you have, but there will be a couple of lights that should come on and be steady and at least one light that will come on and flicker a bit).
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That worked for me at least.
your IP address on your AEBS will still seem like it's not right but at least it works (hopefully).
Good Luck!
Message was edited by: David Hard
Message was edited by: David Hard

IMac reboots every day at 5:56 AM

Recently my work hours changed, so I'm now up at 5:30 AM instead of 6:30. Because of this, I was able to observe that my iMac G4 - sound asleep as I recently was at this hour - reboots every day at 5:56 AM precisely. Obviously some timed script is running, but I can't figure out what it is, where it "lives", and how to stop it. I have the Cocktail utility, so I ran the daily "cron" script - but the system did not reboot. The only things connected to the iMac are speakers, a Lacie 250 GB Firewire HD, and a M-Audio Keystation 49e USB keyboard (not powered on). I have no idea how long this has been going on since I've never been up this early until recently. Anyone have any ideas on what could be causing this?

Problem solved - and boy do I feel stoopid!
After checking out all the suggestions offered, I went to visist the iMac in question (located in the "family" room in the basement) at 5:54 AM this morning, coffee in hand. At precisely 5:56 AM (by my watch) the UPS shut down for a moment and then turned back on. The UPS battery is obviously fried, so the UPS shutdown/restart "reboots" the iMac (set to restart after power failure). Since the iMac is in the basement, I must have missed the warning beeps that signal battery failure. So what causes the UPS to restart at 5:56 AM? I had this experience years ago at a firm located in an industrial park - some nearby factory had machinery that started up the same time every day - heavy duty stuff - and it sent a huge "spike" down the line which wrecked havoc with out network backups. I suspect the same thing here - something "heavy duty" goes on-line at 5:56 AM and creates a power "spike" (or whatever) - the UPS senses the "spike" and shuts down to "spare" the devices connected to it, but since it can no longer provide power while it's off, it effectively "reboots" the iMac.
Solution - buy a new UPS!
Thanks to all who chimed in - sorry it wasn't something more exotic!
Robert

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Dear All,
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OSX now crashes every hour. OSX apps like Dock, desktops, launchpad, finder, toolbar, etc become unresponsive, although sometimes non OSX apps (like Chrome, TextMate, etc) remain functioning briefly. No obvious reason or trigger

OSX now crashes every hour. For no obvious reason or trigger, suddenly OSX apps like Dock, desktops, launchpad, finder, toolbar, etc become unresponsive, although sometimes non OSX apps (like Chrome, TextMate, etc) remain functioning briefly, before the whole thing hangs and needs a hard reboot.
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best,
gene

If you have more than one user account, these instructions must be carried out as an administrator.
Launch the Console application in any of the following ways:
☞ Enter the first few letters of its name into a Spotlight search. Select it in the results (it should be at the top.)
☞ In the Finder, select Go ▹ Utilities from the menu bar, or press the key combination shift-command-U. The application is in the folder that opens.
☞ Open LaunchPad. Click Utilities, then Console in the icon grid.
Step 1
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View ▹ Show Log List
from the menu bar.
Enter "BOOT_TIME" (without the quotes) in the search box. Note the timestamps of those log messages, which refer to the times when the system was booted. Now clear the search box and scroll back in the log to the last boot time after you had the problem. Select the messages logged before the boot, while the system was unresponsive or was failing to shut down. Copy them to the Clipboard (command-C). Paste into a reply to this message (command-V). Please include the BOOT_TIME message at the end of the log extract.
If there are runs of repeated messages, post only one example of each. Don’t post many repetitions of the same message.
When posting a log extract, be selective. In most cases, a few dozen lines are more than enough.
Please do not indiscriminately dump thousands of lines from the log into this discussion.
Important: Some private information, such as your name, may appear in the log. Anonymize before posting.
Step 2
Still in Console, look under System Diagnostic Reports for crash or panic logs, and post the entire contents of the most recent one, if any. In the interest of privacy, I suggest you edit out the “Anonymous UUID,” a long string of letters, numbers, and dashes in the header of the report, if present (it may not be.) Please don’t post shutdownStall, spin, or hang logs — they're very long and not helpful.

Rebooting every 4 hours

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