Hello, This problem is going to be your safety valve coils...basically they get old and over time of heating then cooling develop a short when they heat up...It may appear the gas lights to start but then goes out until the safety valve coils cool back down. Here is a
picture of a set of coils Yours may differ but it's the same concept. You will find them mounted to the saftey valve at the rear of the igniter.
This should solve your problem. Hope this helps, Please feel free to comment again if you have any further questions or concerns. Good Luck! Mike
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