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hi it sounds like you have faulty door switch the contacts in it may be shorted I suggest replacing it first as its not expensive
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There is an air flow issue. Opening the door allows the air flow to change drastically. You will need to disassemble the machine and clean out the air path, including the duct from the back of the dryer to the outside of your home.
May I please have your model number so I am able to provide you with accurate, model specific information?
Are you running it with the front off to watch the flame? It has to be completely assembled for the air flow to be proper. The only way to test it is fully assembled and testing the temperature out the back of the vent.
That is because the air flow is changing. What is the exhaust temperature as it cycles?
There has to be something blocking the air flow (or routing it differently) that is causing the sensor to shut off the heat. The alternative (if you are certain it is all clean inside and all air flow components in place) would be a faulty exhaust thermistor or electronic control.
The gas can't continue to come out with no flame, the entire gas valve assembly would have to be faulty, electrical and mechanical components, and all be bad.
If that is the case, you have dangerous multiple issues and I would turn the gas off and call for professional in home service. I hope you heed that advice as it could turn in to something much different than a broken dryer.