BLUE TONGUE SKINKS

My 4 month old blue tongue has been burrowing a lot.We got him a little over a week ago and he was not burrowing for a full week.Yesterday I started his handling sessions and he was fine with it.Today he started burrowing and hiding completely under the substrate.I know that blue tongues are burrowing species,but I’m just confused about the sudden change.Hes my first blue tongue, so I might be asking some stupid questions, but can I have some advice?

What type is he? Can you post pictures of his setup? Burrowing is completely normal, but I'd like to see his cage.