A full month of silence from someone who was calling regularly is not normal, and it deserves a direct explanation.
Facilities do not restrict phone access without reason, but they also do not notify family members when they do it. If your man received an incident report for a rule violation, loss of phone privileges for three to six months is a standard consequence. That penalty gets imposed quietly on their end and the people waiting for calls on the outside are left wondering what happened.
Judge John Creuzot Judicial Treatment Center is a treatment-focused facility, which means the programming expectations are structured and the rules around compliance tend to be enforced consistently. A violation of treatment protocols, a failed drug test, a disciplinary infraction, or any number of other issues could trigger a phone restriction without any outward indication that something happened.
The most useful thing you can do right now is send a letter through InmateAid. Mail continues to reach inmates even when phone privileges are suspended. Let him know that both you and his mother have not heard from him in a month and that you are concerned. Ask him directly what is going on and whether there is anything you can do.
You can also call the facility and ask to speak with a counselor. They may not share specific disciplinary details, but they can confirm whether he is still there, whether he is in good health, and in some cases whether his phone access has been restricted.
Do not let another month go by without getting some kind of answer.