I've been through 5 switches on my tank in 4 months, same problem over and over. Granted I fish 3-4 days a week minimum so it see's a lot of abuse.
Corrosion and snapping at the wire to the switch connection. It's been under warranty and the shop kept assuring me it they would fix it.
Finally, I just asked for the switch and I would take care of it myself. I covered the switch where the wires connect with so much marine goop and I haven't had an issue as of yet.
