Well, a couple things could be going on, but everything sounds like your snake is healthy, given the information you provided.
1) He explored his new home thoroughly in the first few weeks and is now comfortable
2) He may be going into shed. Keep an eye on him and check him over each time you handle him
3) Some snakes become less active in winter.
It also doesnt hurt to check on his husbandry. Make siue the temps and the humidity are correct, especially ambient. If the air temperature is too cold, he may stay on the hot side as the only way he has to stay warm. Now that winter temps are kicking in, cold is going to be seeping in through the windows and such and could have thrown your temps off.
If you haven't already, I'd invest in an IR temp gun. They allow you to get precise temps all throughout your enclosure when you spot check
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