Weird Issue

We've been having a weird issue going on recently. The motorhome overheats sometimes, and then you let it cool and then it doesn't overheat. Spent the day in a repair facility, Delta Truck, they said it's fixed, but it wasn't, then they brought it in again, now the answer is, we'll we hope we fixed it. Good thing the place was a 24 hour shop as we were there from 6:30am to 10:00 pm. I guess we'll know when we next hit the road.