I, too, have a 2018 Montana 3791RD and we’ve been full-time in it for almost 3 years. Love it. Anyway, whenever my furnace dies that it’s because there isn’t sufficient gas left in the tank. Try this … if it dies again, turn on one of the stove burners. If it lights and stays on, turn on a second burner. I’m thinking both burners will puff and flutter as my wife calls it. If that is true, use a more full tank. If you still have problems I would consider replacing the tank regulator.
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