Nexus 7 - Slide Lock fails; unless I restart

Hi guys - I've searched for days and figured I'll ask for help to see if any of you have experienced or solved this problem.

I have a second Nexus 7 that for some reason (even after factory resets) at the slide lock screen fails to unlock. What happens is I can slide the lock but it just flashes and brings me back to the slide lock screen. If I restart the tablet all is OK until the screen locks again.. Weird - I know.

I've tried to change the unlock from a slide to a pattern and the same results.

Any thoughts?

thanks.

--- Sorry just saw I posted in th wrong forum.. sorry!

After the factory reset, you hadn't installed apps yet and it still messes up? I was just using an app earlier that keeps itself visible on lock and it screwed up and wouldn't respond to my pattern lock.

You're not going to get many answers on this Nexus 7 Accessories forum. I suggest you repost this question on the main Nexus 7 forum.

Have you tried flashing a new firmware or updating your existing stock one over the air?