I have the same problem with bluetooth.
No problem with the phone locking when watching YouTube though.
Edit: Coming to think of it maybe I haven't watched anything longer than the 10 minutes I have before the screen locks...
Same here. I now have my phone unlocked and fille dwith antitheft/tracking software...
This might even be better because now there is at least a slim chance that I'll be able to get the phone back if it's stolen...