N7 goes dead for no reason.

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http://forum.xda-developers.com – I've had my N7 for almost a month now. Upgraded to 4.2.1 almost immediately, so had no baseline to compare against. Device has been working fine and I am very happy with it. That is, except for one small issue: a couple of times it has gone completely dead overnight for no apparent reason. After the first time I installed a task killer and Juice Defender that I use on my S2 with excellent results. Things were working fine and then today the N7 was completely dead again. So dead it would not even turn on until it got 2% charge on it. In looking at the battery stats it showed NFC service account (HowTos)