Home Improvement Questions? Ask a Handyman for Answers
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What is the brand and model number of your unit?
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Ok, there are 2 likely possibilities. One is that you have an overtemp sensor that is shutting the unit down. This is not very likely since few gas fireplaces have one. The other is that a stray main burner flame is impinging/heating up the lower half of the thermopile/thermocouple. The thermo has to maintain a temp difference (the cold junction) between the tip and the base. If it losses the cold junction the small current it generates stops and everything shuts down.