BUT hitting the battery switch next to drivers seat on/off does briefly correct problem.
Wouldn't that be a big clue to at least remove, inspect and clean to bare metal the connections to make certain there is good electrical continuity? Do you know how to use a electrical test meter (volt meter)?
Given your travel difficulties, I suggest you purchase the workshop manual so you have good electrical schematics, an understanding of how the unit functions and the proper test meter.
Let us know what you find.
2012 JD855D OPS Black Poly Roof, Deluxe Cargo Box, Front and Rear Protection, Power Lift, Front Hood Rack, Rear Screen (homemade), 800 Watt Inverter, 2500lb Winch installed in cargo bed, Front and Rear LED auxiliary lighting (4" square 27 watt), Front and Rear CV Guards, Koplin Side Mirrors