It does sound as if he has become anxious about the issue, children do not like to leave the school room to use the bathroom this is all too common ,we hear it a lot. Does he do this on the weekends at home ? I wouldnt use any form of punishment like taking things away, he is probably suffering enough over it. in fact maybe relaxing the talk, being matter of fact, let him be in control of his own habits. sometime less, works better . In my opinion , take a step back, allow him to sort it out , are his 'movements full bowel movements or maybe some mess, partial movements ?
I have read your post and lot of other peoples post and i know where ya'll are coming from.I have a 8 1/2 year old and i have the same problem.Now he did use it when he was about 3 but after a few months started going in his pants again.Then little over a year ago we tried a new method going every 20 mins.and that worked for a little bit but right back to his pants.So ever since then he 's been pooping in his pants.I've done the doctors and different things i've read but so far i haven't had any luck.And its so frustrating.But i try to to keep my head up and tell my self oneday,oneday he'll go and everything will be ok.