So I got myself a nice software tool called WorkPace which advises me to take breaks depending of work intensity, a trackball to use as alternative for the mouse. But depending on how I can improve my tracking skill I'll probably keep using the mouse for games because it's a bit more accurate.
So when my movements freeze in the middle of the game, it's probably a 10-second micro-break by the WorkPace software.
Anyone of you ever had some of these annoying RSI symptoms?