I just got my Nexus 7 today and I'm still feeling it out. When I watch video with the screen horizontal, after a minute or two it locks as if I've pressed the power button - but I haven't. When I try to enter my password to unlock the screen, it will no unlock, no matter how many times I've entered the password. I have to hold down the power button for 10 seconds to reset before it will accept my password and unlock the screen.

Is my device defective? I called tech support and the had me do a reboot. This has not resolved the issue.

Any help would be appreciated.