Help with beardie not eating (long)

[Zoom]

Zoom is about 7-8 months old, male (pretty sure as he has the 2 hemipenal bulges) weighs 350 gms, is in a 4' long X 2' wide x 2' cage with UVB, with temps of 80°-85° on cool side and 93°-100° on warm side, substrate is coconut husk. The problem seems to have started about 3 weeks ago with a notable decrease in his appetite. I had gotten him some superworms as a treat and once he got a taste of them it was like he was on lizard crack and he wouldn't even look at his crickets (I also offer greens every day but he has never been big on them). Anyway I quit giving him the superworms but he still wouldn't barely eat any crickets- unless I hand fed them and then he would only take a couple. I also noted at this time that he appears to be digging into his substrate and sleeping alot. I worried about the decrease in appetite so I got him some mealies and he seems to take those ok but he will only eat 4-6 a day. He used to gobble down 50 crickets a day. I thought perhaps he was impacted as he had not defecated in a couple of days (although he only goes 3-4 times a week normally) so I gave him a warm bath and he had a large but normal looking stool. Anyway does anyone have any idea what could be going on? Sorry this is so long.