I just wanted to know if anyone out there has have this happen to them. My navigation touchscreen function stop responding/working. I can't press I Agree, control the A/C, pretty much the screen will not respond to any touch function. my car is still under warranty, thanks goodness. I've had other vehicles with touchscreen based navi before but nothing like this happens before. I will call the dealer Monday to schedule an appointment for them to take a look at this problem. I hope they replace me with a new unit so future problems won't come up again.