I have a 788CI HD unit. Current issue has developed, in that whenever I cycle thru the view screens, as soon as I get to the gps mapping screen and zoom in or out, the unit powers down.
Other screens perform fine. At some stages during it's power down phase, a "dos type" screen appears with menu functions such as keyboard check, reset and a few other options. I tried a few of them, but it appears to put the unit into a loop until I disconnect power and restart the process again.
It appears to be only affecting this unit (998C SI unit performs fine with no issues).
Aside from sending to Humminbird for diagnosis (no warranty), any ideas on what I may be able to trouble shoot?