Loss of ignition power

Have a 2013 Transtar MF 11 that loses all ignition switch power while driving-like the ignition switch was turned off. Still have flashers and cab light. Stays dead for about 15 mins, something resets, and I can start the truck and drive for a few miles and it happens again.
UPDATE-drove truck loaded and mostly uphill for 15 miles today and it shut down 4 times. Reset after 17-24 minutes each time and started back up. Each time coolant temperature was above 210. Coming home, unloaded and mostly downhill-temp was at 180 and made it all the way home with no shut down.

 

Instrument cluster goes dead-gauges frozen in place until reset. 10 speed manual. No headlights, just emerg flashers and dome light work. Good voltage, engine cranks and fires right up after reset

 

That was it Heavyd. Removed all battery connections and 100a fuses to the cab at the firewall, cleaned and reconnected them but then had no power to the cab. Found that one of the fuses was bad after jostling it around and cleaning it. New fuses on the way. Thanks Heavyd.