Every once in awhile, I've noticed that my speedometer isn't working properly. I'll be in 2nd, but the speedometer will say I'm doing around 90! Or, it will do the opposite, I'll have it in 5th, and it will say I'm only doing about 30. It doesn't do it often, and I haven't found any common factor as to the days when it does it. But, I've also found that once I shut the bike off, and it cools down, next time I ride it, it's working properly. Any one else have this problem, or have any idea what's causing it?