Mine acts stupid sometimes when it gets cold around here. It will be reading OK then jump to over 100mph for a second. Few times it climbed to over 100 slowly (I was only going 40 at the time) then settle down. Couple of times it was a zero. At first I thought it finally cratered but when I bumped the trip Odo reset it started to work. When is wazzes out I just tap or press the reset button and it goes back to normal. I figure it's a cold solder joint in the board or a goofy mechanical glitch.
