My Ascent has about 7500 miles on it and I've used the navi system several times with no problem. On a recent weekend trip, we used to navi to get to our destination. After lunch, I tried inputting a new destination address only to discover that the system wouldn't allow me to input it. I tried going into the "Previous Destinations" screen and they were all blank; so were the "Points of Interest" screens. The map showed my current location, but the system didn't let me do anything. I gave up and about 15 minutes later, shut off the car and restarted it. At that point it was like my navi reset itself-- all the screens were back to normal and I could program in destinations etc. I haven't been able to recreate the situation and just wondered if anyone else has experienced this? Thanks!