Just bought a nexus 7 2 days ago from Walmart...16 gig...batch C70...like some I had screen lift on left..WiFi issues...well after 2 days my screen isn't responsive at all.I rebooted over 6 times and Nada. So I took back and got a replacement.This time from C60 batch and this thing is flawless...no lift...perfectly flush and WiFi is great.Needless to say I was worried of getting an even worse one but glad to say I didn't.just wanted to share my experience...hope everyone gets there problems resolved...