Occassionally when driving the LCD goes totally wacko and gets all jarbled. This usually happens where there is a sharp jolt to the car from bumps in the road, road reflectors, etc. A sharp rap to the display brings it back in line. The previous owner said he just had it replaced. This leads me to believe that it is just a matter of a ground loosing connection on the connector, possibly some minor corrosion on the connector. Any thoughts before I tear into the dash?