Randomly Getting Logged Out/Sent To Login Screen

Three times today, I have been playing, then suddenly, the game jumps to the log in screen. No freeze up or anything, just one second I'm in game, the next I'm at the log in screen.

Have no idea what the cause of this could be, as the first time it happened while clicking around in my inventory in the lioneye's watch. The second happened while I was walking around an act 1 map (Can't remember which one.). The third just happened, I was going from cross roads, waiting for chamber of sins level 1 to load. Then bam, same as the two times prior, I was at the log in screen.

Only started happening today, after my game patched. Have been playing for 3 days now on the previous patches, and didn't have it happen once.

Possibly needless information:

Was playing a bow ranger every time this happened.

PC specs are in my signature.

Running Windows 7 x64.

Have latest radeon drivers installed.