Please Help!

I have a male ragdoll, just turned one (he has been spayed). He is a very beautiful cat - we decided to choose a ragdoll due to their relaxed nature. unfortunately my Ragdoll has recently started to attack me! Out of the blue, i can be walking past him and he'll launch an attack on me, jumping on my leg, biting and scratching! he has caused many injuries! This also happens when he is being stroked. My ragdoll is never alone, and gets plenty of love and play as my partner works from home. He is in good heath and is very good with his litter tray. He doesnt attack my partner and is also very good natured with other male members of the family.

I find it difficult to groom him as he bites and scratches - but as he needs grooming often due to his fluffy fur - this cant be helped. I dont know how to tame his wild ways, or what to do for the best when he launches an attack! i normally have to retreat to another room while he calms down. does anyone have any advice as to what to do for the best?

Thanks!