Please check if your firmware is the latest in Fnatic OP? You can find this under the 'Device Info' section in the software.
We can recommend you to update the Windows and update your drivers in order to see if that will resolve the issue.
If the issue is still not resolved, try to re-install your OP software and perform a keyboard reset.
With the keyboard plugged in:
1. Locate the reset hole on the underside of the keyboard (below the keyboard feet)
2. Use a pin and hold in the hole for 10+ seconds.
3. Observe the keyboard RGB flashing, and wait for the reset to complete.
Another thing you can try is to open Device Manager, expand USB Serial Bus Controllers, right-click on USB Root Hub and then click on Properties.
Click on the Power Management tab and uncheck the Allow the computer to turn off this device to save power box.
Try to use a different USB cable to connect your keyboard to your PC, and also try connecting the keyboard into a different PC port or directly into the motherboard.
If the issue remains do not hesitate to contact us on firstname.lastname@example.org along with the video recording of the problem, your order ID and serial number for the keyboard.