It would help if you can tell a bit about your beardie and enclosure.
How old is your beardie, how long have you had him/her,
Have you changed anything in the enclosure that might cause some stress
Name of UVB and how far from the basking spot is it,
What type of thermometer do you use to check temps and what are the temps in basking, warm and cool areas and
What is the substrate you use in the bottom ?
I know someone with lots of experience will pop in to help, they will need at least answers to these, if not more questions, to help rule out things and zero in on the problem.
I hope everything is OK with your little one!
Amanda