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What is the basking temp?
This normally means they are over heating.
Heat related gaping is more prolonged than a few seconds in my experience. This sounds like a yawn or a stress response to the OP's presence.
Asking for temps was good due diligence, but at those temps you can rule out overheating.
If the gaping is accompanied by a popping sound, it's time for a vet visit for a respiratory infection.