I've been having an issue lately with my keyboard and I think I have narrowed down the cause to Intel's USB 3.0 drivers.
When my keyboard (Corsair K70) is plugged into any USB 3.0 port on my computer (ports are through Z370 chipset), after a short period of time or nearly instant, my num, caps, and scroll lock indicator lights on my keyboard freeze when using those 3 keys. The only way to unfreeze them is by unplugging/plugging back in the keyboard. This issue does not happen on my ASMedia 3.1 ports.
I have seen numerous other forum posts online discussing this issue with many different keyboards and motherboards. I have gotten a replacement keyboard, updated all my drivers, and even reformatted my computer and the issue will not go away.
Info about my PC that may help:
-Gigabyte AORUS Gaming 7 Z370 Motherboard
-Intel 8700k
-Corsair K70 keyboard on latest drivers/firmware
Drivers installed:
Standard USB 3.0 eXtensible Host Controller - 1.0 (Microsoft) -- Version 10.0.16299.125
USB Root Hub (USB 3.0) -- Version 10.0.16299.64
Generic USB Hub -- Version 10.0.16299.64
USB Composite Device -- Version 10.0.16299.15