I've run across this bug twice now after flipping through channels and cycling power on/off. The screen splits into thirds.

See video here: http://sideburn.com/vid/tinytvbug.mov

Anyone else have this happen? I have 8 videos most are around 30 mins of video and two are large with 2 hours of video. Wonder if thats related.

Yeah this is normal... the settings.txt file has a powerOffSecs parameter that is defaulted to 300 seconds.