[JRTJH]

I don't think changing regulator pressure is going to help. It "may" reduce the refrigerator symptoms at high altitude, but as said, what will it do to the furnace, water heater and stove/oven? Additionally, to "set the regulator" for operation at high altitude by reducing the WC pressure will "throw it off" at lower altitudes.

It sounds more like either an "air adjustment" (carbon buildup on the burner orifice) or a control board malfunction. I'd first follow the Dometic burner cleaning instructions (DON'T PUT ANYTHING IN THE RUBY DRILLED ORIFICE) and if that doesn't work, I'd look at replacing the control board. DINOSAUR ELECTRONICS builds a "very reliable" aftermarket board. I've used their products with great success in refrigerators, furnaces, water heaters. So far, I've replaced a number of "failed" OEM boards, but I've never had to replace a Dinosaur board.