Weird Mountain Lion Error: Not Writing to Disk

I've been having a problem where my MBP running Mountain Lion.
Since updating to 10.8.2, my computer will randomly lose its the ability to read and write to disk. Files will not save, keychain access fails (asking me to reenter my passwords, which I won't do), and apps will not open (stuck bouncing on the dock).
Booting into safe mode and/or resetting PRAM appears to fix this, but it's happened three times already. Because I cannot save my documents, all data is lost. Disk Utility does not find any drive errors or permissions problems.

I still can't figure this out. It seems to happen after I have moved my computer from one location to another after putting my Mac to sleep. (Trouble waking from sleep? Different wifi signal?)
I thought rebooting helped, but one time, I restarted my computer in class (after experiencing this problem) and the applications still wouldn't save. I reset the PRAM, and it was fixed (for now). This has happened to three times already.
Reported my problem here. Hope Apple is listening.
http://www.apple.com/feedback/macosx.html
Did this start with 10.8.2 for you as well?

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          http://www.bombich.com/
    http://www.shirt-pocket.com/SuperDuper/SuperDuperDescription.html
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    Some other results from the same search:
    http://forums.macrumors.com/showthread.php?t=1071850
    https://discussions.apple.com/thread/3635034?start=0&tstart=0

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