Hi guys, was having the same issue but mine arose when I added 1 extra fan to my build to complete all the fan slots (had 9 now 10), I initially thoughts the problem was because the new fan I added wasn't updated to the newest firmware, but then I started having pump issues (like not working, for added reference it's the iCue Link H150i RGB) all other fans in my system are all QX120 iCue link.
I tried splitting the devices so the power was being shared more to the AIO, it's 3 fans and 1 extra on one side of the hub and the other 6 fans connected to the other side of the hub and still no go on it working.
For reference I watch The Provoked Prawn for some troubleshooting but it ultimately didn't work in the end.
*MY SOLUTION* I SWITCHED THE HUB FAN LINK CABLE FROM THE CPU FAN HEADER TO THE PUMP FAN HEADER AND IT'S SEEMED TO HAVE FIXED THE ISSUE.
I will update if any further issue's arise, but I hope this helps anyone in the meantime, temps have been at a nice steady 30-32C since doing this, as apposed to the shooting up to 80C it was doing with the issue.