Safari randomly shuts down... why?

Question

I could be web browsing, watching netflix, or have the mac closed only to come back to find that all my safari windows had shut down. I don't have very many programs running, I've cleared my cookies, I have no idea why it could be doing this but it's extremely inconvenient. There's no load signal as if it was trying to load something, it just literally crashes. Why could it be crashing and what can I do to fix this? I just bought this mac brand new a few months ago and have all the software updates installed. I have the OS X Yosemite 10.10.
Any help would be greatly appreciated.
Thanks!

Answer 1

(Early 2009 iMac, 2.66 GHz Intel Core 2 Duo, 4MD RAM, OS X version 10.10)
I'm having the same problem almost every night while I'm asleep. I stream "music to sleep by" from a website every night, all night. Since loading Yosemite, Safari seems to shut itself down sometime during the night (always AFTER I'm asleep, but before dawn). Looking at console logs for last night, I see my system backups running successfully every hour, then something different after the 4 a.m. backup. Note: After this sequence, there were no more hourly backups until I woke the computer manually at roughly 9:30 a.m. — at which point the iMac went through another successful back-up. Console sequence shown below:
November/22/14 4:10:01.474 AM com.apple.backupd[5064]: Backup completed successfully.
November/22/14 4:12:02.691 AM SystemUIServer[219]: Attempt to use XPC with a MachService that has HideUntilCheckIn set. This will result in unpredictable behavior: com.apple.backupd.status.xpc
November/22/14 4:21:15.220 AM com.apple.iCloudHelper[5070]: objc[5070]: Class FALogging is implemented in both /System/Library/PrivateFrameworks/FamilyCircle.framework/Versions/A/FamilyCircl e and /System/Library/PrivateFrameworks/FamilyNotification.framework/Versions/A/Famil yNotification. One of the two will be used. Which one is undefined.
November/22/14 4:21:15.230 AM com.apple.xpc.launchd[1]: (com.apple.imfoundation.IMRemoteURLConnectionAgent) The _DirtyJetsamMemoryLimit key is not available on this platform.
November/22/14 4:21:15.816 AM com.apple.xpc.launchd[1]: (com.apple.imfoundation.IMRemoteURLConnectionAgent) The _DirtyJetsamMemoryLimit key is not available on this platform.
November/22/14 4:51:00.020 AM InstallerS[5081]: >>>>>>>>>>>>>>>>>> InstallMac:::  start application
November/22/14 4:51:00.020 AM InstallerS[5081]: >>>>>>>>>>>>>>>>>> InstallMac::: applicationPath == /Users/Reuben/Library/Application Support/com.genieoinnovation.Installer/Completer.app/Contents/MacOS/InstallerS
November/22/14 4:51:00.116 AM InstallerS[5081]: >>>>>>>>>>>>>>>> [AppInfo getTriggerVal] ==  ltvbit
November/22/14 4:51:00.301 AM InstallerS[5081]: >>>>>>>>>>>>>>>> [[AppInfo appMountPoint] ==
November/22/14 4:51:00.675 AM InstallerS[5081]:  $$$$$$$$$$$$$ <key>install_mc_offer_id</key> 0
November/22/14 4:51:00.801 AM InstallerS[5081]:  $$$$$$$$$$$$$ <key>agent_update</key> 0
November/22/14 4:51:01.008 AM InstallerS[5081]:  $$$$$$$$$$$$$ <key>disable_dynamic_update</key> 0
November/22/14 4:51:01.088 AM InstallerS[5081]:  $$$$$$$$$$$$$ <key>server_version</key> 0
November/22/14 4:51:01.986 AM InstallerS[5081]:  found idle : 24642
November/22/14 4:51:01.986 AM InstallerS[5081]:  GList Safari 7.100000 is Higher  runtime version  : 8.000000
November/22/14 4:51:01.986 AM InstallerS[5081]: terminateSafari
November/22/14 4:51:07.458 AM com.apple.xpc.launchd[1]: (com.apple.imfoundation.IMRemoteURLConnectionAgent) The _DirtyJetsamMemoryLimit key is not available on this platform.
November/22/14 4:51:07.486 AM com.apple.iCloudHelper[5092]: objc[5092]: Class FALogging is implemented in both /System/Library/PrivateFrameworks/FamilyCircle.framework/Versions/A/FamilyCircl e and /System/Library/PrivateFrameworks/FamilyNotification.framework/Versions/A/Famil yNotification. One of the two will be used. Which one is undefined.
November/22/14 4:51:07.496 AM com.apple.xpc.launchd[1]: (com.apple.imfoundation.IMRemoteURLConnectionAgent) The _DirtyJetsamMemoryLimit key is not available on this platform.
November/22/14 4:51:08.358 AM spindump[4671]: Got xpc error message in libspindump client connection: Connection invalid
November/22/14 4:51:08.358 AM garcon[4733]: host connection <NSXPCConnection: 0x60800011b5a0> connection from pid 4481 invalidated
November/22/14 4:51:08.398 AM CoreServicesUIAgent[4704]: unexpected message <OS_xpc_error: <error: 0x7fff7bbc9c60> { count = 1, contents =
  "XPCErrorDescription" => <string: 0x7fff7bbc9f70> { length = 18, contents = "Connection invalid" }
}>
November/22/14 4:51:08.857 AM com.apple.xpc.launchd[1]: (com.apple.WebKit.Plugin.64.056E4A7F-6A2F-49C6-9088-C86DEF7C5C6F[4493]) Service exited with abnormal code: 1
November/22/14 4:51:09.164 AM com.apple.xpc.launchd[1]: (com.apple.WebKit.Networking.3FD41DB3-BF6F-41FC-8081-B5C3C7DB70DC[4484]) Service exited with abnormal code: 1
November/22/14 4:51:09.471 AM bird[4705]: notify name "CKStatusReport" has been registered 40 times - this may be a leak
November/22/14 4:51:10.992 AM nsurlsessiond[4708]: Being asked if container with identifier com.apple.clouddocs.com.apple.Notes is foreground before getting callback from BRContainersMonitor!
November/22/14 4:51:10.992 AM nsurlsessiond[4708]: Being asked if container with identifier com.apple.clouddocs.com.apple.Notes is foreground before getting callback from BRContainersMonitor!
November/22/14 4:51:12.373 AM nsurlsessiond[4708]: Being asked if container with identifier com.apple.clouddocs.F3LWYJ7GM7.com.apple.garageband10 is foreground before getting callback from BRContainersMonitor!
November/22/14 4:51:12.373 AM nsurlsessiond[4708]: Being asked if container with identifier com.apple.clouddocs.F3LWYJ7GM7.com.apple.garageband10 is foreground before getting callback from BRContainersMonitor!
November/22/14 4:51:12.469 AM InstallerS[5081]: doABWhitelist
November/22/14 4:51:12.531 AM InstallerS[5081]:  ABP not installed
November/22/14 4:51:13.905 AM nsurlsessiond[4708]: Being asked if container with identifier com.apple.clouddocs.U97HH4RE69.com.vimov.weatherhd is foreground before getting callback from BRContainersMonitor!
November/22/14 4:51:13.905 AM nsurlsessiond[4708]: Being asked if container with identifier com.apple.clouddocs.U97HH4RE69.com.vimov.weatherhd is foreground before getting callback from BRContainersMonitor!
November/22/14 4:51:15.433 AM nsurlsessiond[4708]: Being asked if container with identifier com.apple.clouddocs.F3LWYJ7GM7.com.apple.mobilegarageband is foreground before getting callback from BRContainersMonitor!
November/22/14 4:51:15.433 AM nsurlsessiond[4708]: Being asked if container with identifier com.apple.clouddocs.F3LWYJ7GM7.com.apple.mobilegarageband is foreground before getting callback from BRContainersMonitor!
November/22/14 4:51:16.783 AM nsurlsessiond[4708]: Being asked if container with identifier com.apple.clouddocs.com.apple.system.spotlight is foreground before getting callback from BRContainersMonitor!
November/22/14 4:51:16.783 AM nsurlsessiond[4708]: Being asked if container with identifier com.apple.clouddocs.com.apple.system.spotlight is foreground before getting callback from BRContainersMonitor!
November/22/14 4:51:17.525 AM watchdogd[105]: [watchdog_daemon] @(        pm_callback) - ref=0x0 msg_type=0xe0000270 msg=0x1fc0004
November/22/14 4:51:17.000 AM kernel[0]: PM response took 175 ms (26, powerd)
November/22/14 4:51:17.000 AM kernel[0]: PM response took 176 ms (26, powerd)
November/22/14 4:51:17.000 AM kernel[0]: PM response took 176 ms (221, coreaudiod)
November/22/14 4:51:17.000 AM kernel[0]: PM response took 191 ms (330, PulseTray)
November/22/14 4:51:17.000 AM kernel[0]: PM response took 191 ms (330, PulseTray)
November/22/14 4:51:17.000 AM kernel[0]: PM response took 191 ms (39, dsAccessService)
November/22/14 4:51:17.000 AM kernel[0]: PM response took 191 ms (4207, DashboardClient)
November/22/14 4:51:17.000 AM kernel[0]: PM response took 191 ms (4208, DashboardClient)
November/22/14 4:51:17.000 AM kernel[0]: PM response took 191 ms (343, Dropbox)
November/22/14 4:51:17.000 AM kernel[0]: PM response took 192 ms (316, MFManager)
November/22/14 4:51:17.000 AM kernel[0]: PM response took 310 ms (346, ConsumerTouchDri)
November/22/14 4:51:17.000 AM kernel[0]: PM response took 390 ms (243, sharingd)
November/22/14 4:51:17.000 AM kernel[0]: PM response took 390 ms (243, sharingd)
November/22/14 4:51:17.000 AM kernel[0]: PM response took 406 ms (372, LaterAgent)
November/22/14 4:51:18.000 AM kernel[0]: PM response took 478 ms (44, BBDaemon)
November/22/14 4:51:18.000 AM kernel[0]: PM response took 506 ms (219, SystemUIServer)
November/22/14 4:51:18.000 AM kernel[0]: PM response took 515 ms (4600, netbiosd)
November/22/14 4:51:18.000 AM kernel[0]: PM response took 516 ms (60, blued)
November/22/14 4:51:18.040 AM watchdogd[105]: [watchdog_daemon] @(        pm_callback) - ref=0x0 msg_type=0xe0000280 msg=0x1fd0003
November/22/14 4:51:18.041 AM watchdogd[105]: [watchdog_daemon] @(    wd_daemon_thread) - events buffer: 42r820 3694s820 3792r156471 11037s156471 11324r408381 12295s408381 12330r420629 14346s420629 14381r474847 44355s474847 44389r1181226 49417s1181226 49827r1302561 51249s1302561 51285r1317426 82143s1317426 82176r2060243 87860s2060243 88208r2192507 90255s2192507 90290r2287835 121308s2287835 121354r2751501 128780s2751501 129188r2896507 132810s2896507 132846r3218932 162641s3218932
November/22/14 4:51:18.000 AM kernel[0]: PM response took 168 ms (323, PhotoStreamAgent)
November/22/14 4:51:18.000 AM kernel[0]: PM response took 214 ms (44, BBDaemon)
November/22/14 4:51:18.000 AM kernel[0]: PM response took 225 ms (158, VDCAssistant)
November/22/14 4:51:18.000 AM kernel[0]: PM response took 389 ms (327, PenTabletDriver)
November/22/14 4:51:18.000 AM kernel[0]: PM response took 519 ms (39, dsAccessService)
November/22/14 4:51:18.000 AM kernel[0]: PM response took 519 ms (55, securityd)
November/22/14 4:51:18.000 AM kernel[0]: PM response took 568 ms (60, blued)
November/22/14 4:51:18.000 AM kernel[0]: PM response took 768 ms (259, identityservices)
November/22/14 4:51:18.819 AM coreaudiod[221]: 2014-11-22 04:51:18.298407 AM [AirPlay] Power: SystemWillSleep
November/22/14 4:51:18.000 AM kernel[0]: PM response took 867 ms (4658, coreduetd)
November/22/14 4:51:18.000 AM kernel[0]: PM response took 869 ms (255, imagent)
November/22/14 4:51:18.943 AM coreaudiod[221]: 2014-11-22 04:51:18.942686 AM [AirPlay] BTLE client stopping to browse for AirPlay Solo Target Presence.
November/22/14 4:51:19.056 AM coreaudiod[221]: 2014-11-22 04:51:19.055930 AM [AirPlay] BTLE discovery removing all devices
November/22/14 4:51:19.000 AM kernel[0]: PM response took 1017 ms (221, coreaudiod)
November/22/14 4:51:19.228 AM coreaudiod[221]: 2014-11-22 04:51:19.227917 AM [AirPlay] BTLE client stopped to browse for AirPlay Solo Target Presence.
November/22/14 4:51:36.000 AM kernel[0]: PM response took 3146 ms (26, powerd)
November/22/14 4:51:36.000 AM kernel[0]: AirPort_Brcm43xx::powerChange: System Sleep
November/22/14 4:51:36.000 AM kernel[0]: 00000000  00000020  NVEthernet::setLinkStatus - not Active
November/22/14 4:51:37.000 AM kernel[0]: [IOBluetoothHostControllerUSBTransport][ReceiveInterruptData] -- kIOReturnAborted, data size is 0, but data in buffer -- (data Length = 4, packet length = 6)  Data Content:
November/22/14 4:51:37.101 AM discoveryd[51]: Basic Bonjour,Warn Warning: IPv4 listener multicast send failed en1, 50
November/22/14 4:51:37.101 AM discoveryd[51]: Basic Bonjour,Warn Warning: IPv6 listener multicast send failed en1, 50
November/22/14 6:39:34.000 AM kernel[0]: Wake reason: RTC (Alarm)