Well, I think this is a USB 2.0 issue, where perhaps a BIOS setting isn't allowing full UEFI USB operation until Windows has fully loaded (My old NZXT Grid+v2 which used USB 2.0 for control also did this after some updates and then it didn't after others) or it's a Lian Li software bug for it's control software. I'd check to see if there are any firmware or software updates for the fan controller.
aorus x570 elite WIFI
Amd Ryzen 9 3900X
LIAN LI AIO
LIAN LI o11 dynamic
Case fans: lian li uni fans 2 sets of 3
set on the bottom and the back side both are intake and the aio fans are on top putting the air out
I am using the lian li fan hub
yes im sure its a few minutes its on on off sometimes
they just started acting strangely
Do you have the fan header the hub is connected to set to voltage (DC mode) or PWM mode in the BIOS?
Is there any chance that you've updated (Or it automatically updated) the Lian Li software between when it worked normally and started the new behavior? I used to see problems like this all the time, random and varied problems, with the NZXT fan controller and CAM software, so I wouldn't be surprised if this was the result of a bug in the software or firmware, if you've updated the firmware on it. If you haven't, and if it HAS firmware that can be updated, you might check into that as well.
Did the fan hub come with the fans or the case, or did you buy it separately. Would really help to know the model of the fan hub, exactly, if it isn't the one that came with the fans or with the case.
If it came with the fans, exactly which kit did you buy? Did you buy a three fan kit, which came with a controller, or did you buy all these Uni fans individually. Kind of might make a difference in trying to figure out why it's doing this.