Starting with the pre-loaded 1.02.07 firmware i had the problem that movies would stop after 50 - 60 minutes. Tried to pause, rewind, forward - which worked ok but the movie would not play again. Tried with .mkv and .wmv movies. After that when going to Home and starting other movies it tells me to try known/correct formats.
After soft-resetting it works fine. I can forward to the point that broke and watch from there on.
Upgraded to 1.03.01 - same problemNow i downgraded to 1.02.10 - hope it works now!
Update: Same with 1.02.10 and 1.02.11. Might as well go back to 1.03.01 and perhaps get other benefits, while reseting once in a while...

Update 2: Now with 1.03.01 sound set to Stereo AND using USB1 instead of USB2 - everything runs fine! Go figure...thing it could be the USB-swap, but haven't done more investigating right now...