This is the same exact issue I am having with my daughter's 2015 Edge Titanium. No sound, started with static to no sound, now no sound whatsoever. even the back up warning "beep beep beep" is not audible. I was a tech for Ford in the 90's so a little of tech knowledge here. All fuses checked. Connection at amplifier checked. Sync 2 updated. Also having the same issue with the ability to change from fm to XM etc. stays locked on the current setting.