Whats wrong with my bunny rabbit?

when i bought him he was about 7-8 weeks old and ive had him about a month now when i bought him the lady i bought him off said he had something wrong with him when he was born like he only had part of his brain but the vet said he'd be fine. rcently he just runs in circles and kind of has little spaz attacks and he ALWAYS licks the wireing to his hutch? is he ok?