When I turn on the key, the speedometer does the full sweep of the gauge. Now and then , it will stick at about 60 mph on the gauge and start from there. One day I checked the speedometer and I was going 130 mph and thinking it sure is handling that speed very well. Oh Oh the GPS says I am going about 70 Mph. My question, is there a fix for this. A dealer checked and installed an up date, thinking it might fix it, but it did not work. It dose it hot and cold. but only ever once and a while.