Hello ferdinand,
Try using a different USB port and see if the problem persists. Also, keep the unit plugged in and disable the adaptor in the device manager. If the DVD playback works, I'd look into re-installing the drivers possibly (1.30 is the latest as of Feb of this year).
I've not heard of anything like this before, perhaps someone else could shed some light on the problem or offer some of their guesses.
Best of Luck,
Russ