F4st1DiO

@Lucario, you deserve a beer or whatever you prefer. It did the trick on Nightsword as well. I'm shocked. Because of the same issue (and thanks to Amazon) I replaced a Glaive, and a DarkCore... and I was going to surrender and buy another mouse of another Brand. To be honest, I had the M65 but did not had this specific issue. I tried with compressed air, but didn't solved. I don't want to open the mouse to keep the warranty, and your trick was 100% working, so thank you so much. (still astonished how easy it was.... lol)