FlyerTalk Evangelist
Join Date: Dec 2002
Location: Danville, CA, USA;
Programs: UA 1MM, WN CP, Marriott LT Plat, Hilton Gold, IC Plat
Posts: 15,722
I had this issue occur with aftermarket chargers for my iphone4. It seems to be a glitch. The easy solution is just to change chargers, they are pretty cheap even for OEM.