What do you do when you get complaints from your child's teachers?

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This has got me really worried. My son who's eight and a half, although very lively and extremely friendly and social was never the fighting sorts. He has lots of friends. Till class 2, his teachers gave remarks in his report card saying he was the best-behaved boy in class. Suddenly, from last year, we've been getting complaints from his class teacher that he misbehaves in class and fights with other boys. But, this academic session which has begun just a month back, everyday he's getting remarks saying that he misbehaves. Last year, we thought, the teacher disliked him but this year, it's almost all teachers saying so. His class teacher, who's a very sweet lady and is quite fond of him, sent for me yesterday and told me that my son and his friend had got into such a bad fight that they scratched each other and banged each other's heads against the wall. He's getting very disobedient. He's an extremely sensitive and mature child, otherwise. But, why is he behaving like this? Yes, to be fair to him, his classmates do fight with him. Once, someone scratched him with a blade. He says the teacher always catches him when he's defending himself and that they never scold or punish the other boys. Last year, I started working after a long time. He spent a lot of time with his dad who was mostly home as he was studying. And, this year my husband's joined back his work and has been posted far away. Could it be, that he's missing his dad or that dad's disciplinary tactics are not being used? Sometimes, my heart goes out to him. What do I do? Please help.