That would be my first guess. My pair does it too.
I find he moves his doors on a regular basis. The yasha disapears for a day or 2 then shows up again. I don't think the yasha is at risk of being trapped.
Is it possible there is another opening in another spot you can not see?
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Lynn
75 gal Starphire front and sides with a 43 gal sump/refuge reef.
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