Iphone 4 warm and battery power lost in half a day

my iphone 4 has been very warm, lost battery power from 100% to 20% in half a day. its done this twice since i got it in march. i only txted on person today and i didnt use my 3g at all or wifi. please help

Just in case anyone finds this thread - the problem was fixed with a later OSX update.

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