Seems like lots of people have problems with our RGB fans beginning to randomly flicker, I've got the same problem aswell. Started happening some days ago.
Have uninstalled every other RGB software, reinstalled iCue several times, tried Corsair Link, re-arranged the fans on the Commander Pro and RGB Hub, reinstalled drivers etc.
Here is a video showing the problem with my LL fans:
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This is only showing the front fans. The one in the back and the two in the top also have the same problem.
What to do?