I have a 737. It would just go off on its own sometimes know it wont even turn on called humminbird they said it was a problem withh the microprocessor. Its 4 months past the warranty they said cost 105.00 to fix seems ridicoulus when the unit was only 300.00 brand new. Anyone have any advice or suggestions? Oh its not a problem with my wiring either plugged my other unit in it worked i even brought it inside and plugged it up to the 110 with an adaptor.