I have the same problem...
After a few minutes in wireless mode the mouse falls back to some hardware mode which I don't even have anymore in iCUE...
I just got the mouse back because of the broken scroll wheel...
This is my last corsair product and also I will tell everybody I know to not buy anything from this brand anymore...
Also, reviews wherever I can and all social media will be used to spread this message
I would advice everybody to do the same because right now it looks to me like Corsair is not listening at all...