Nexus 7 tabs has some manufacture defect. Many user complaining that their tablet display have began to come apart from the bezel-- the adhesive seemingly isn't working correctly.
According to Google's returns page, customers only have 15 days to send it back. As for those who purchased the tablet from Staples, GameStop and other retail outlets, take it back and exchange it for a new one before the 30-day return window expires. Then again, retailers are having a hard time keeping these tablets in stock even for those who pre-ordered the device, so it's no wonder owners are taking matters into their own hands.
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http://www.tomshardware.com/news/Nexus-7-Jelly-Bean-Dead-Pixel-Screen-Separation-DIY,16362.html
