Yea im with Ren .. if it bothers ya you should get it checked out. I personaly dont have that problem while or after playing. I do have that problem during a workout at the gym. Was trying to fill up my water bottle and couldent for the life of me hold that thing still to fill it up...lol. I know it is due to strain and exertion of the muscles in my arm. Maby our problems have something in common? My shakes go away after a few minutes of rest though.