My iPhone 4S on Sprint only charges to 94% on my wall charger in my bedroom all night, but when I put it onto my computer charger in the AM it goes up to 100% after about 10 min. I returned my charger and cord to the Apple store and they tested my phone which was at 97% at the time and it went up to full charge. They gave me the charger and cable they used to do this as a replacement but still it did not work last night. I really do not get it. Can anyone help me with this or does anyone have the same problem. I have 5.01 installed...