What's up with the radio in my cascadia!??

Started driving for a company a couple months ago and when I got the truck the radio did not work. The truck needed some small maintenance like a hose but my boss lady sends me to Macon to the dealership.. they did that plus they found something they said needed to be changed. Had a brand new Panasonic on the seat. All I had to do was slide one out, put one in. Radio worked for 2 or 3 weeks and then went completely out. Came back on a few minutes later and played the rest of the day maybe and then nothing. A couple weeks later I was running hard as hell and my truck ran hot. Took it back to the dealership and they say my ECU didn't match and was the cause for the overheating. Changed it and found some more stuff to fix, get it back, radio come on long enough for me to look at it and it's out again. This time my air don't get cold anymore in the cab but does in the sleeper. Took it back and they put on a compressor. Got tired of riding in silence so I check the radio and it's good. Checked the fuses they good. Man at Petro discovered a ground wire to a battery was completely unattached put it on and that didn't work. Every thing else works fine just no tunes.. I recently purchased a overdryve 8 pro and I want to hands free myself. This suck and I need help. I'm my own worst enemy. Tired of suffering in silence.. HELP