My thoughts on the mental hospital arc is the extended stay in the jail is bothering him to no end.
If you think about it, in his previous incarceration, he has only spent a weekend in jail after his macing incident. He seems to think he will be sent home where he can deal with it at a later time.
We saw in his September court appearance that he wanted to go home and "get his stuff". He has said in subsequent letters that he expected to be sent home at the next court hearing in February. When that did not happen, he must have chimped out.
His odd behaviour before the chimpout would have had the guards on edge, so whatever happened during the meltdown was enough to get them to send him to the mental hospital. (I have heard some tales on the extreme measures guards might go to if a inmate so much as utters that he wants to kill himself, for example)
So as for this latest chimpout that Chris has alluded to that happened at the end of this stay at the puzzle factory? For me, the reason only has one conclusion: he learned he was being sent back to the jailhouse, and not being sent home.