Possibly he is feeling way too cold. At the basking area, more than 110 F must be reached to allow proper thermoregulation.
Typically they stay digged if they do not find a brigth and HOT place for thermoregulation
Also I do not like your subrtrate. Round graiend dust free sand is the subtrate of choice for plateds with a moister cornmer wit some moss or mulch for sleeping, shedding and hydration.
Also do not forget that these lizards do come from light intensive habitats. So tank lights are almost dimn in comparison to what they are adaptet to. Hence a metal halide of 150 W and up should be present in its setup, to give best light intenisites.

Hope that helps

Ingo

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