I don’t know much about audio systems, but the sound on the aftermarket radio in my Cutlass will cut out at times. It’ll come back on after I power off the unit and turn back on. This happens on the radio input only. Bluetooth paired to my phone sound always works. Unit has a good ground. I Returned and replaced the Head unit and same problem occurs. There is a amp in the trunk and it seems to be on and hasn’t blown a fuse. Any thoughts?