getting ready to brumate?

[salmar]

my beardie is about 15 weeks old, he's perfectly healthy and lately he's been going under neath his flat log during the day and staying there for most of the day. He is eating like normal and basks for a while then goes under his log. i put him back in his basking spot but he just returns under his log after a few minutes. Is he getting ready to brumate?

 

[LJean]

Seems awfully young to me to be wanting to brumate. I thought it was for only the adults. Young dragons don't have enough fat stores to get them through the winter.

Sometimes the temps aren't right or something with the bulb is going on that can cause them to want to hide.
What are the basking temps? Which uvb light are you using? Can you hear any noise coming from either bulb?

 

[salmar]

the temps: basking spot: 109
warm side: mid 80s
cool side: high 70s
UVB: Reptisun 5.0

and there is no noise coming from the bulbs