While playing i had a weird problem: my cursor started to shake. No special action triggered it, it just started, and after a minute, stopped. Then it started shaking again after a while, and stopped in the same manner.
I'm wondering if anyone else had it, and it's a glitch, or it's just my mouse is starting to break down.

(My mouse never did something like this so far, it moves smoothly everywhere else)

My desktop has little pieces of dirt on it and it can get shaky. But as soon as I move the mouse it stops. Sometimes even the cursor runs wildly over the screen and stops after a second, so yes I've had it.