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How long does it run before it shuts down?
I would have the LP pressure at the tank regulator checked and adjusted if needed as this should be done at least once a year and is often neglected. Be sure that the battery(s) are in good shape and full of water and that the terminals are clean and corrosion free. It sounds like the control board may have the flame sense going bad, but I need to know how long it runs before going off. That is usually about 10 seconds when this happens. If it runs for several minutes, then chances are that there is some debris in the ductwork from mice or perhaps they have been closed off and the furnace is building up heat due to lack of air flow and shutting down due to the limit switch overheating. Those would be some of the things to check here. Please get back to me if you need more or would like a copy of the Atwood Service Manual for this model. All follow ups are included in our fee.
Just checking back in to see if you were able to resolve this issue or do you still need some additional input from me here?