I have experienced this issue with both my last Corsair mouse (an M65), and the M65 Pro I bought last year. It's pretty annoying. All of a sudden the Left button will 'auto fire' in games until I click it again to stop it, and also button 4 (thumb button on mouse, not the sniper button) refuses to work sometimes. Quit the iCue software (latest version), and it works again. Is there ever going to be a fix for this, it's been going on for quite some time.