My computer consistently wants to quit at about 60 miles every time out. It starts by jumping around in the mph reading, going to zero for awhile, then quitting altogether only to seem to come back on and work properly 10 miles or so down the road. It drives me nuts. I've pulled out the connections, cleaned the contacts, made sure everything is lined up and attached properly. It works flawlessly for the first 60 miles. Any ideas??