On my head unit i have a usb and aux connection has been working fine for last couple years but recently when i use either of them my back speakers and sub stop working but the fron ones still work and they are connected to the same amp as the rear speakers but on cd and radio all work fine. Do you think there is problem with my head unit or something else?
try cleaning the contacts, they may be dirty and not letting the signal pass through, or if the usb drive is really old try a new one.
