Should I return my nexus 7

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http://forum.xda-developers.com – Hi all I've had my nexus 7 about two weeks from Tesco , I've only really got round to hammering it the last week due to being on holiday from work and I love it. Unfortunately the last two days I've noticed problems with it its a c70 , first problem slight screen raise lower left corner but more drastically over the last day its gone from one dead pixel to about 20 spread throughout the screen should I return it or is this the normal. Sent from my HTC EVO 3D X515m using xda app-developers app (HowTos)