I have the same mouse and have experienced the same problem since I bought it. Sometimes it only happens now and again and does not cause too much inconvenience, but other times it is every other reboot, just no rhyme or reason at all.
I built a new PC last year motherboard from a different manufacturer and was hopeful this problem would be solved, but it is no different!
I saw this thread today and did a bit more research and found another thread on here from someone having the same problems but with a different model of mouse.
https://forum.corsair.com/v3/showthread.php?t=174934
I've followed the instructions from there and hope this solves it.