Whack the top of the dash board above the gauges. Try it 4-5 times harder each time, but not enough to put your hand through the dash. It sounds barbaric, but it has been solving my problem for 3 years now. Only does it maybe once every couple of months. My buddy is a Dodge mechanic, his jeep has been doing the same thing for over 5 years and this solves his problem for a bit everytime.