Vel'koz animations bug, please help!

Okay, so I have been playing a fair amt of vel and what i have noticed is that his animations suddenly stop working and his autoattack becomes rigid with no animation, his swirly tentacles go rigid in 3 directions like a pyramid on its side, and it becomes very difficult to cs with his autos early game and it's overly distracting all game. Please help me, and tell me if there's anything i can do about this!