I am a seasoned audio video installer, recently I did a 900 in a '05 sport trac. I performed the video bypass with the mute wire, all was well for a while, however, now the customer complains that it "locks up" and goes to the navigation warning screen while he's driving down the road, repeatedly. I have XM, iPOD, and a backup camera hooked up to the unit, everthing works, but the primary loading sequence is slower than 2 old people phucking. Can I get a little insight