hello everyone. I just recently purchased a 2015 expedition max it has all the bells and whistles. The problem I am running into is this. The headunit would be work fine (radio) at times if it hit a bump or anything the radio turns off and I cant get it to turn back on. The screen still has the heater control functional just no sound you can connect your phone and it will show up on the screen but no sound . I tried resetting it a few times when this happen and it would work at times and sometimes not. So I purchased the upgraded version sync 3 since I didn't like the look of the sync2 and thought the apim was going bad. it was working fine for a while but now its back, radio goes out hold the buttons to reset it doesn't work, I have to turn off the car to see if it comes back At time it comes back and works fine and at time still nothing. I believe it could be a lose ground, or possible relay. Any advice welcomed at this point.