Try watching a live broadcast, such as a baseball game. Have a timer set to record the game, and begin watching in live mode when it starts. Anytime after 15 minutes in, hit pause, and leave it on pause for at least 10 minutes. When you resume play all kinds of fun things happen...stuttering video....in the middle of what you're viewing the 622 will revert back to the beginning of the event....frame freezes....audio sync issues.
Anytime I do this with a live broadcast, happens every time. Stopping the recording is the fix, but you end up in the live mode, back in real time. I have 2 622's (same cabling/identical TV's) and can duplicate it every time.