Random Logging off.

Not sure if this is because of Mountain Lion Preview 2 or if it's my Macbook Pro's Hardware but after a few minutes of using my Macbook Pro freezes up and then throws me to the log out screen.

I have a 2007 Macbook Pro 2.2GHz Core 2 Duo

Repairing Disk Permissions didn't work
Resetting PRAM didn't do anything.

I looked through the console log and found this around the time it through me off:

mdworker[8327]: (Error) Import: Couldn't recover plist from xattr com.apple.metadata:FileSyncAgentExcludeItem

Also getting:

com.apple.launchd[1]: (com.apple.launchd.peruser.502[8405]) getpwuid("502") failed