Help!-wont charge- A USB driver has exceeded its power limits?!!?

my iPhone charged just fine for the past two months, and now it only charges sometimes.
I will plug it into the wall charger, and it will charge just fine, and then i'll go to charge it again sometime, and it just wont charge, so i tried to plug it into my macbook, and my imac, and they both said "a USB driver has exceeded its power limits, etc, etc." and so i tried my PC, and it gave me the same message. This has happened more than once, and eventually it just charges, but then the whole situation will repeat days later.
I've called apple over 3 times, and no one has helped me. so...
help??

First, try a different cable. It may be shorting out causing the USB port to overload. Especially since it happens on two computers.
If the cable is ok, try turning the iPhone off. This can be done by holding down the sleep and home buttons until the off slider appears. Then restart it.
If this doesn't help, take it to an Apple store for assistance.

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