I had this when I used to roll a lot, I'd say they happen after a period of heavy abuse and lasted a few weeks, maybe a month at the most. They went away although it's a pretty scary thought to think maybe you have involuntary muscle movements for the rest of your life.
Just control your doses, only stick to a single dose, or don't dose more after the first hour or so. I find that dosing a nice dose and a small booster dose within the hour works perfect. But don't wait longer than an hour or you will certainly feel some added negative effects. And space your rolls out 90 days, optimally.