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What is the make and model number of your furnace? Get back to me with this info and I can help you sort this out.
I have never heard of any "D rated burner" but, then I live at 2,500 ft. I do know that you need to make a regulator adjustment at that elevation. There would be too much LP for the available air at 10,500 ft. So you have to lean down the regulator a few turns. Even then, you should have a full tank of fuel. You might consider getting a catyalic heater for that when you are at high altitudes as they work differently. Just a thought. Another thing I would do here is to change out the ignition module to an after market board made by Dinosaur Electronics as they are far more reliable than the OEM boards. Those have a high failure rate. That may be part of the problem here. Hope that proves helpful. Please get back to me if you need more as all follow ups are included in our fee.