Hi my iphone 4 is losing the sounds when locking, unlocking, playing apps, music playing and texting. Ive checked the settings and there are all fine. It comes up with a message saying this accessory is not for this iphone, even if its not connected to anything! Ive always used my genuine apple charger and leads, ive tried a system restore and back up and the problem still persists! Thanks for your time tom.