Check the pilot burner closely, it's like a mini blowtorch aimed at the thermocouple. I've seen several instances where insect nests/debris have restricted air to the tiny burner causing a shorter flame that doesn't apply enough heat to the thermocouple.
On the other hand, if it goes out after the main burner is lit there could be an issue with restricted gas supply possibly caused by a pinched line or a failing regulator.
Would be helpful to monitor gas pressure (with a manometer) at the unit's gas valve before and after the main burner lights.
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