I am trying to repair a Cobra 29 LTD Classic for a friend and it jumps down a channel out of the blue while your talking. The last time it did it I took the top cover off and pushed down a little on the board and it went back to the right channel. I got the radio talking great (keys 2 swings 25) but it wont stay on 1 channel. If anyone has advice I'd definately appreciate it. Thanks in advance.