I had something similar happen here ONCE (Corsair Platinum 64 GB DDR5 2x32, Z690 Extreme).
You're running Armoury Crate too, right? My guess is that there might be a conflict between Armoury Crate and iCue, although I can't be sure since I only experienced this issue once and I normally avoid opening Armoury Crate like the plague.
In my case *I think* I experienced the issue after running Armoury Crate - suddenly I look at my RAM and the RGB animation is frozen in place. iCue no longer recognizes the RAM. I rebooted the PC (no hang though) and iCue still couldn't see the RAM.
Went to the BIOS, toggled SPD Write on and off again, forced a save. Not sure if that did the trick or if powering off the PC is what did it (as in turning the switch off at the back of the PSU so the mobo no longer gets standby current).
Do you have the issue with [SPD Write Disable=FALSE]?
Have you tried bios 1403 with bios all default settings except [SPD Write Disable=FALSE] and the issue still occurs?
What did you do between you set [SPD Write Disable=FALSE] and RGB on the RAM sticks stops working? for example, idling for 1hr or adjust settings in corsair iCue?
Was the ram detected in corsair iCue when the RAM RGB stops working?
Did you use Armoury Crate uninstall tool to uninstall Armoury Crate?
Thank you for your reply.
What is the probability when you enable SPD Write > boot into windows > idle on the desktop for two hours?
May I have more detail about stress testing and the probability?
Have you tried bios 1304 with bios all default settings except SPD Write enabled and the issue still occurs? If you also adjust other bios settings, please restore bios to all default and then enable SPD Write to see if the issue still occurs.
If you idle in 10 hours, does the issue occur at least once?
Is your ram in our qvl list?
To make sure compatibility, please use the ram in our qvl list.
Also, please try reseat ram sticks and reinstall corsair iCue app.