Support Phone shows charging - not plugged in

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http://androidforums.com – Strange thing just happened on my Wifes's DINC4G She looked at the phone and the battery icon showed that it was charging. I went into settings -> battery and sure enough it displayed Charging (AC) A reboot cleared up the issue, just wondering if anybody else has seen this. Normally something small like this would not phase me, but it with a charging issue could be indicitive of a potential hardware issue. Thanks for your input. BTW. Phone is 100% stock, unrooted on the most recent OTA firmware. (General)