Macbook Pro Freezing for 3 Minutes Every Hour

I have a Macbook Pro with a 2.66GHz Intel Core 2 Duo, 4GB of memory (1067 MHz DDR3), running OS X 10.8.4.
Within the past couple weeks, my computer has started freezing for about 3 minutes at a time, exactly one hour apart. The time that it freezes seems to vary slightly based on how many/which programs I currently have running, but as long as my open programs don't change, it always sticks to that schedule (e.g., for most of today it has been every 40 minutes after the hour, so 3:40, 4:40, 5:40, etc).
I looked at my console logs around this time, and it has roughly the same thing going on each time it freezes.
At 5:40:
9/15/13 5:39:47.190 PM com.apple.launchd.peruser.501[143]: (com.apple.tccd[11302]) Exited: Killed: 9
9/15/13 5:39:47.000 PM kernel[0]: memorystatus_thread: idle exiting pid 11302 [tccd]
9/15/13 5:39:48.947 PM com.apple.launchd[1]: (com.apple.cfprefsd.xpc.daemon[11301]) Exited: Killed: 9
9/15/13 5:39:48.000 PM kernel[0]: memorystatus_thread: idle exiting pid 11301 [cfprefsd]
9/15/13 5:41:40.000 PM kernel[0]: disk0s2: I/O error.
9/15/13 5:43:02.000 PM kernel[0]: disk0s2: I/O error.
At 6:40:
9/15/13 6:39:24.343 PM com.apple.launchd[1]: (com.apple.sleepservicesd[11377]) Exited: Killed: 9
9/15/13 6:39:24.000 PM kernel[0]: memorystatus_thread: idle exiting pid 11377 [SleepServicesD]
9/15/13 6:39:34.932 PM com.apple.launchd[1]: (com.apple.sleepservicesd[11378]) Exited: Killed: 9
9/15/13 6:39:35.000 PM kernel[0]: memorystatus_thread: idle exiting pid 11378 [SleepServicesD]
9/15/13 6:39:50.501 PM com.apple.launchd[1]: (com.apple.sleepservicesd[11379]) Exited: Killed: 9
9/15/13 6:39:50.000 PM kernel[0]: memorystatus_thread: idle exiting pid 11379 [SleepServicesD]
9/15/13 6:40:00.853 PM com.apple.launchd[1]: (com.apple.sleepservicesd[11380]) Exited: Killed: 9
9/15/13 6:40:00.000 PM kernel[0]: memorystatus_thread: idle exiting pid 11380 [SleepServicesD]
9/15/13 6:40:11.811 PM com.apple.launchd[1]: (com.apple.sleepservicesd[11381]) Exited: Killed: 9
9/15/13 6:40:11.000 PM kernel[0]: memorystatus_thread: idle exiting pid 11381 [SleepServicesD]
9/15/13 6:40:22.569 PM com.apple.launchd[1]: (com.apple.sleepservicesd[11382]) Exited: Killed: 9
9/15/13 6:40:22.000 PM kernel[0]: memorystatus_thread: idle exiting pid 11382 [SleepServicesD]
9/15/13 6:41:49.000 PM kernel[0]: disk0s2: I/O error.
9/15/13 6:43:13.000 PM kernel[0]: disk0s2: I/O error.
At 7:40:
9/15/13 7:38:43.463 PM com.apple.launchd[1]: (com.apple.sleepservicesd[11484]) Exited: Killed: 9
9/15/13 7:38:43.000 PM kernel[0]: memorystatus_thread: idle exiting pid 11484 [SleepServicesD]
9/15/13 7:38:43.805 PM com.apple.launchd[1]: (com.apple.cfprefsd.xpc.daemon[11480]) Exited: Killed: 9
9/15/13 7:38:44.000 PM kernel[0]: memorystatus_thread: idle exiting pid 11480 [cfprefsd]
9/15/13 7:38:44.119 PM com.apple.launchd.peruser.501[143]: (com.apple.cfprefsd.xpc.agent[11479]) Exited: Killed: 9
9/15/13 7:38:44.000 PM kernel[0]: memorystatus_thread: idle exiting pid 11479 [cfprefsd]
9/15/13 7:39:09.385 PM com.apple.launchd[1]: (com.apple.sleepservicesd[11485]) Exited: Killed: 9
9/15/13 7:39:09.000 PM kernel[0]: memorystatus_thread: idle exiting pid 11485 [SleepServicesD]
9/15/13 7:39:10.267 PM com.apple.launchd.peruser.501[143]: (com.apple.CalendarAgent[11477]) Exited: Killed: 9
9/15/13 7:39:10.000 PM kernel[0]: memorystatus_thread: idle exiting pid 11477 [CalendarAgent]
9/15/13 7:39:25.749 PM com.apple.launchd[1]: (com.apple.sleepservicesd[11486]) Exited: Killed: 9
9/15/13 7:39:25.000 PM kernel[0]: memorystatus_thread: idle exiting pid 11486 [SleepServicesD]
9/15/13 7:39:54.287 PM com.apple.launchd[1]: (com.apple.sleepservicesd[11487]) Exited: Killed: 9
9/15/13 7:39:54.000 PM kernel[0]: memorystatus_thread: idle exiting pid 11487 [SleepServicesD]
9/15/13 7:41:39.000 PM kernel[0]: disk0s2: I/O error.
9/15/13 7:43:36.000 PM kernel[0]: disk0s2: I/O error.
At 8:40:
9/15/13 8:39:10.467 PM com.apple.launchd[1]: (com.apple.sleepservicesd[11530]) Exited: Killed: 9
9/15/13 8:39:10.000 PM kernel[0]: memorystatus_thread: idle exiting pid 11530 [SleepServicesD]
9/15/13 8:39:11.164 PM com.apple.launchd.peruser.501[143]: (com.apple.tccd[11527]) Exited: Killed: 9
9/15/13 8:39:11.000 PM kernel[0]: memorystatus_thread: idle exiting pid 11527 [tccd]
9/15/13 8:39:11.436 PM com.apple.launchd.peruser.501[143]: (com.apple.CalendarAgent[11525]) Exited: Killed: 9
9/15/13 8:39:11.000 PM kernel[0]: memorystatus_thread: idle exiting pid 11525 [CalendarAgent]
9/15/13 8:39:20.863 PM com.apple.launchd[1]: (com.apple.sleepservicesd[11531]) Exited: Killed: 9
9/15/13 8:39:20.000 PM kernel[0]: memorystatus_thread: idle exiting pid 11531 [SleepServicesD]
9/15/13 8:39:24.290 PM com.apple.launchd[1]: (com.apple.cfprefsd.xpc.daemon[11492]) Exited: Killed: 9
9/15/13 8:39:24.000 PM kernel[0]: memorystatus_thread: idle exiting pid 11492 [cfprefsd]
9/15/13 8:39:24.540 PM com.apple.launchd.peruser.501[143]: (com.apple.cfprefsd.xpc.agent[11491]) Exited: Killed: 9
9/15/13 8:39:24.000 PM kernel[0]: memorystatus_thread: idle exiting pid 11491 [cfprefsd]
9/15/13 8:41:16.000 PM kernel[0]: disk0s2: I/O error.
9/15/13 8:43:09.000 PM kernel[0]: disk0s2: I/O error.
etc...
From what I can tell, it starts to freeze around x:40, and then it appears to start working again when the first I/O error is listed. It works for maybe 10 seconds or so, then freezes up again until the second I/O error, at which point it is fine for an hour.
Does anybody have any ideas about what I can do? Thanks in advance for any help.

The boot drive is failing, or you have some other hardware fault. Make a "Genius" appointment at an Apple Store, or go to another authorized service provider.
Back up all data on the internal drive(s) before you hand over your computer to anyone. There are ways to back up a computer that isn't fully functional — ask if you need guidance.
If privacy is a concern, erase the data partition(s) with the option to write zeros* (do this only if you have at least two complete, independent backups, and you know how to restore to an empty drive from any of them.) Don’t erase the recovery partition, if present.
Keeping your confidential data secure during hardware repair
*An SSD doesn't need to be zeroed.

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          1.54 GB            Wired RAM
          389 MB             Page-ins
          0 B                Page-outs

Back up all data immediately as your boot drive may be failing.
This diagnostic procedure will query the system log for messages that may indicate a hardware fault. It changes nothing, and therefore will not, in itself, solve your problem.
If you have more than one user account, these instructions must be carried out as an administrator. I've tested them only with the Safari web browser. If you use another browser, they may not work as described.
Triple-click anywhere in the line below on this page to select it:
syslog -k Sender kernel -k Message CReq 'Channel t|GPU D|I/O|n Cause: -' | tail | open -ef
Copy the selected text to the Clipboard (command-C).
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.
Paste into the Terminal window (command-V).
The command may take a noticeable amount of time to run. Wait for a new line ending in a dollar sign (“$”) to appear.
A TextEdit window will open with the output of the command. Normally the command will produce no output, and the window will be empty. If the TextEdit window (not the Terminal window) has anything in it, post it — the text, please, not a screenshot. The title of the TextEdit window doesn't matter, and you don't need to post that.

Macbook Pro Freezing for 3 Minutes Every Hour

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