How old is Albi? He could be trying to brumate. Alot of beardies do slow down on eating and basking during the winter months.
Have you gone over your set up with anyone on here? How old is your UVB?
At 6 months he is a bit young to go into a full brumation. If you are using a fluorescent tube UVB, like Reptisun.. it might help to go ahead and change it out now. They should be changed every 6 months anyway.
The other thing you can do is take out his cave, at least during the day, so that he will bask.
6 months is how long I've had him, he was very small when I had him so he can't be much older than 6 months, I had him in May.
How old are they when they start to Brumate?
Generally they don't go into a full brumation in the first year. There are those few exceptions though. There are some who do kind of a semi-brumation before reaching a year old. They tend to get lazier and their appetite lessens. 6 months is still a bit young though.
Have you checked your temps lately, with the weather getting cooler, to make sure they are good?
You may need to just keep an eye on him. Make sure he is not losing any weight.
How are his stools? Has he had a fecal lately?
He's still the same, he's been under his hide all day again today, he seems to be eating okay and is the same as ever when being handled, he is able to support himself and his head is always raised when he's out of his Viv, still I'm concerned though.