After the momentary foot switch stopped working on my Motorguide trolling motor, I was told to check the rubber boot that fits on top of the switch. It was torn so I replaced it. Then the switch would not release after taking your foot off of the controller unless you pulled up on the side of it. I then replaced the entire switch with a new rubber boot and still have the same problem. I have taken the switch in and out several times and it seems to work correctly until I spend a couple hours on the water. It seems like such a simple thing to be having problems with but I am out of ideas. Any suggestions?