With CUE version 1.13.36 I am still having this problem, however, it no longer requires a restart to fix.
Side buttons on the scimitar will stop functioning, or one button will 'stick' and repeat the keybind indefinitely. To fix this I have to exit CUE and then relaunch CUE. When it happens again, and it always does, I just have to restart CUE again.
Please resolve this issue.