hi, since about 2 weeks charging has become difficult. sometimes when connected it will not show the lightning charge symbol top right corner and it also does not make that sound when you first plug in the charger. often it goes down to between 10 and 20 % then suddenly it charges again. it is problematic if i want to be out for the whole day and i can not charge. so far i tried to clean 8 pin contacts, reset the ipad to original settings, changed cable, chose many different sockets. no use. have other people had to change the charger itself ? also what is the proceedure to get a new charger. my ipad4 is less than 6 months old. no apple shop near.