Onan 7500 Quiet Diesel shutting down after 5 minutes

I have an Onan7500 Quiet Diesel generator in my 2002 Fleeteood Revolution. More often than not the generator will run for 5 minutes and then stop. It will immediately start back up and run for another 5 minutes and then stop again. Sometimes it will do the same but for 8-10!minutes. Probably unwisely, I’ve done this over and over for an hour or two until it starts and doesn’t stop. At that point I’ve probably had it run all day for hours on end until I hit the stop button. All filters and fluids are changed regularly. The oil level is fine and I've checked it before starting, while running and after it shuts down. The coolant level is fine as well. Any ideas? Has anyone else had/have similar experiences? Not opposed to taking it to an authorized Onan service center to get it fixed as there is one not too far from my house. What I don’t want is getting the run around saying it could be this or that and spending lots of money only to have the problem still exist. Seems like it pulled a code that offered no diagnosis except to take it to in for service. I posted this a few days ago but for some reason the post got closed.