I have iphone 5 and i have problems with charging. 1-I put in charge and can not charge ,it go from 3 persent to 100persent and when i turn off and turn on i see 32 persent,and turn off and turn on i see 12persent. 2-I chanche the buttery with a new one,the same problem again. 3-I change the dock charger ,and the same problem again. What to do ,please help!