Brumation is usually only once a year but they can have cycles in which they slow down a bit. He shouldn't be losing much weight during these times though so it's important to monitor that. What do you have in place for UVB lighting? How old is it? Lighting and temperature can have a direct effect on their health and appetite.
I think you need to check your temperatures, the UV source, and perhaps increase the time the lights and heat are on each day to "give your beardie the hint".
I just set Swordtail's timer for his bath and paused it so I could actually fill his soaking bowl up and he crawled over my phone and canceled the timer
Mirage came out of brumation on April 26. He was doing great. On May 2 he started acting funny. We just redid his tank, and he keeps going into one of his hides. He just lays there. He shows no intrest in food. HELP!