UPDATE. After 2 1/2 days at the dealership. The final guess was to disconnect the battery for a half hour and disconnect my car from the app. I had to reconnect my car to the app (just like when you first get your car). It was a pain, especially since all my settings were wiped out and I had to start all over again. The navigation didn't work quite right at first. I kept getting a new message that said "frequency out of range". However, strangely after about 48 hours the navigation has started working like it is suppose to. I hope the problem was solved by the reboot, but time will tell. After all, it worked just fine for 8 months prior. I still believe there is a software problem that Toyota hasn't found yet. I just hope it doesn't extend to other systems.