hi guys wanna ask something,recently I bought ipod touch 4th gen for my gf and now something weird happen. The usb charger seem has some probs. When it charge halfway it stated the accessories for charging is not supported and it stop charging. Can we exchange the usb charger to the new one at any ipod official retailer? Does the accessories came with 1 year warranty also? One other thing does the usb charger compatible with 3rd party AC adapter o USB charger as my gf often outstation and seldom bring her laptop.