Hello,
I very recently purchased an M65 Ultra wired, upgrading from an older M65 Elite that was starting to get the double-clicking issue. So far the mouse has been great, save for a rather annoying issue with the Mouse 4 (Back) / Mouse 5 (Forward) buttons which, when iCUE is running, act as if they are being held down when I press them for longer than approximately 7-10 seconds.
As mentioned, if I close iCUE this issue is completely eliminated.
I have attempted to soft reset, force upgrade the mouse's software (v. 1.13.33), and reinstall iCUE (v. 4.18.209), all to no avail.
Hopefully someone here has a solution.