My 4 year old starts school in September and has been going to nursery since he was 1 year old so knows them all well. He has always been excitable and doesn't like to be told no but will stamp his feet but usually gives in as he sees he is not going anywhere. He was hitting children at nursery but we seemed to have turned the corner on that and he has now stopped and this has been the case for a while and was being really good and walking away from situations where he knew he was going to get into trouble. But the last couple of months he started lashing out at the workers at the nursery and has escalated in the last few weeks, nearly every day we have a phone call or we have to go and collect him because he has lost it and thrown things around in the nursery room or has hit or bitten the nursery workers. He wont do this at home he will sulk and go into a mood but doesn't lash out and I am at a complete loss as to why this is happening, we have tried reward charts books nursery are spending 1 on 1 time with him and we talk to him about it all the time but he just says he doesn't know why he does it. We are both so stressed out about it and I'm in constant tears as he never did this he was in nursery's words a polite little boy but he seems to completely different. Any advice would be greatly appreciated.