Hello out there. We are brand new travel trailer owners and have a question about our Atwood water heater. I kept hearing our water heater propane flame "flaming out" as it heated the water. I watched the burner flame appear and disappear a number of times. The water does become hot, but what's the deal with the flame coming and going? Is that normal? It was like the igniter having to keep reigniting the propane gas.