I haven't heard of any others with something like this. Not sure if you can get anything out of your log folder and zip it up but it would be worth a look for some little clue. This could be a failure to stay synced with the server, or it could also be something like damaged files. Basically, I'm saying it is an unknown, but it seems to be unique to you.

Try backing down that OC and put that chip at stock and see what you get. I have read in the past that multi-core AMD chips can have timing problems between cores due to the chip's architecture. Or, I think I read that anyway...