would not believe me when I said my st4000 control head
was bad until I told them I had run a new direct separate power line from my batteries to the AP, had my control head
fail while motoring (so voltage was at 14.2) and had no failures when I swapped out to my friend's control head.
Their response to this kind of failure is that it is always low voltage drops causing the electronics
to reboot back into start up mode. I believe that they're probably right on this call most of the time.