I’m having a really bad experience with my new Elecom EX-G.

It actually worked fine when I first got it, but it’s getting worse. No matter how much I clean or re-grease the ball, the tracking is getting more jittery, or dropping out completely. I tried changing out to the ball from my M570, but it seems slightly too big and doesn’t roll smoothly.

Specific model: M-XT3URBK wired (was tired of worrying about batteries and signal).