I had this problem only once with my Asus 3080Ti ROG Strix 012G, and as you mention, I simply unplugged the power cable, waited 5 minutes, plugged it back in and the leds had gone out.
I haven't had this "problem" since.
Seems to be a bug maybe in the firmware or a component, I don't know, because even with the leds on the GPU works normally.