Join Date: Dec 2018
Location: Mt. Pleasant, MI
Might be a long shot, but something similar was happening to me a few weeks ago. Turns out the engine was overheating and shutting down for self preservation. Letting it sit for a while cooled it down enough that it would start back up until it got too hot - rinse repeat.
I couldn't figure out what was wrong - the fan was coming on. When I watched the coolant levels after the fan would kick on, they would lower, so the tstat was working. I burped the radiator, changed the coolant, checked oil - everything I could think of. I started riding around with the engine temp up on the display, and started to notice that when the temp would hit 204 the fan would kick on and lower the temp back down to about 194, but then it did something weird. It would let the temp get up to about 210, then the fan would kick on but switch back off when it got back down to about 200. Then it would wait until 215, kick on, and lower it back down to about 205, then turn off. It would eventually let the temp get up WAY too high without any intervention from the fan. When I googled those symptoms, I very quickly learned that it was the inline 20A circuit breaker for the fan - it was corroded and not working properly. One trip to O'Reilly Auto Parts, about $8, and 20 minutes later and I was back in business.