Water Heater issues while using electric

[JasonViau]

I have a 2017 Montana 3810 MS Legacy.

I've been operating my Suburban brand water heater on both electric and gas. Recently, I switched to electric only. It was working fine for a couple weeks and then all of a sudden, I didn't get hot water any longer.. I checked switches, fuses, breakers and the control panel and all were in working order.

I switched back to gas and it worked fine. It is a brand new 5th Wheel and I expect all to be in working order so I contacted a mobile RV repair company to see why the electric isnt working.

They came out, and when they tested it, it started working again making me look like an idiot. They charged me $175.00 for their troubles. I can't send the bill to the warranty place because no issues were found....

I kept it on electric after the service call three days ago, and last night, when I was getting ready to take a shower, there was no hot water...

Has anyone on here had intermittent how water while using electric only? I'm wondering if its some type of "relay" issue or something like that so I can hopefully avoid more unnecessary service calls.