Well that was easy, I think. It was the radio. When I installed the single din radio it came with a very thin single din adapter that won't stay tight. There was also no easy way to add a rear support bracket so I wedged a piece of foam under it which worked for a while till the din adapter loosened up allowing the radio to bounce upwards in the rear and smack the ducting which in turn telescoped thru the ducts throughout the dash. The antenna adapter and two connectors also sit there and were probably hitting the duct. I wedged some memory foam in there yesterday and all seems good now. Might see if there is a better din adapter available.