Everything is shutting down because the main circuit breaker is being tripped… then it resets after 30 seconds. So need to determine what is causing the circuit breaker to trip - which could be just about anything electrical that can short or overheat/expand. probably something that can take a hundred hours to diagnose and fix for $1.00.
Once had a similar problem with a car, when it rained. every time the car was at the shop, it was not raining. Finally, after it died on the side of the road, I wasn't alone, so with the hood open, my friend tried to start it and since it was dark and raining, saw a lightning bolt arc across two wires that had the insulation rubbed off due to the proximity of a sharp tab on a metal clip. A little black tape and it fired up and got home, then cut and spliced the wires and filed down the metal tab.

 

Friends bike, different year, but similar problem. Ran fine, then all power disappeared. Turned out that the positive battery cable ran from the battery to the starter, & from there a different gauge wire fed the entire electrical system. That feed wire was broken at the crimp in the connector. You couldn't see it because the insulation held it together. We found it by just pulling on wiring.

If nothing else helps take a look at the wiring diagram & concentrate on any area that feeds a main distribution point.