Update: Its fixed, at least for the last 36hrs.

And all it took was to disconnect the negative terminal on the battery for an hour or two. The drive to and from work today the NAV was perfect and normally its FUBAR. My friend did the same to his truck and his is perfect too.

Crazy thing is, is that we have disconnected the batterys before. I guess disconnecting the negative side is the key and more for a few seconds.

Wayne

 

Just wanted to say....due to this thread I was able to fix my nav issue that was larger tire related. My nav started acting up the second I put on the new tires....and all I did was disconnect the negative terminal for 20 or so minutes and all fixed. Not sure how long you have to wait, it just turned out that we waited 20+ min. Thanks