Don't know if will be helpful but think I have found a way to consistently get it to freeze
Start iTunes and begin downloading several items from iTunes U, etc. enough to keep it busy
While still downloading other items, start playing one of the completed video downloads
After about 5-10 minutes it will freeze pretty consistently and you need to reset with power/home
If you stop all background wifi activity (no download, email sync, calendar sync, etc.) then try to play
videos I have not yet been able to get a freeze to occur
I am sure Apple is working on the issue and hope this helps until we see an update