I installed a f-90BT in my wifes 07 Jeep Wrangler last year. About 6 months ago, after starting the jeep, there was no sound. The Nav worked and everything shows to be working just no sound. I assumed that it was my back yard wiring so I took it to a radio shop and after $75 and 8 hours, it was fixed. They told me that they "re-wired" it and everything is fine. Over the weekend the same thing happens again. Nav works, USB shows music playing but no sound. Has anyone had this problem? I am far from a radio guy but if it is wiring, wouldnt everything be going crazy or it wouldnt power up?