Greg, just got a brand new 959 a few weeks ago, upraded from 700 series units. Installed on boat.
Problem: Hitting some buttons causes the unit to power off. ?? Changing views works sometimes and other times results in power down, same with some of the quick set buttons. Software version 6.820 Took it off the my boat and plugged it into a friends boat with an existing 958, same issues on his boat with my unit and his cords.
Any idea what the problem is? I think it has to be something in the unit since it did the same thing on two boats.