The only thing i can think of is a few weeks ago i moved him from a small tank to a larger 10g tank.... maybe that stressed him out so much that all be does now is burrow? I really dont get it... what im thinking about doing it leaving him in the basement for a week where there is no one around and seeing if that helps on this is that there is no daylight in the basement so it will be "night mode" all the time.... also what are you guys using as a lid for your tanks i have a grated one and a plastic one.... shouldi be using the plastic one so all the humidity stays in?