My son is doing about the same thing. Only I believe that the stresses from my husband and I, even though we aren't arguing, but not talking, the kids sense our discomfort and projects our unworded frustration onto others.
My husband is going away for 1 year military deployment and he's concerned and mad at the same time. TO make matters worst, we are moving one week after his father leaves. So, he's going through a lot of changes.
I just wish that he could handle it better.
I wish you all the best. I will pray for you and your family.
Maybe we could help if we knew what form the behavior took and why the Teacher cannot deal with it?