I'd suggest plugging the keyboard into a different USB port or a USB 3.0 port. If you're using an AMD X570 motherboard there are known issues with the USB2.0 port in general. Also testing the keyboard on a different system to isolate it the keyboard and your system

Very good, thank you both for the help

I personally never was a big fan of Logitech's RomerG switches on my G810 keyboard. I prefer the traditional mechanical switches either linear or tactile. The Z15 will let you find the switch type you like as long as the switches support SMD LEDs and are 3 pin (you can use 5 pin switches but will need to clip off the 2 extra legs)

I'm having this issue on INTEL mobo, asrock z590 steel legend. also it only happens with this keyboard. I was using a cheap mechanical keyboard without any issues and regular keyboards too

alright I checked all the settings on bios and windows.
I switched my usb ports always usb from the mobo but problem keeps happening
Now I'm testing to plug the keyboard on USB 3.0 ports from a PCI-E card that I have installed on the PC
I feel like it's working better than before but on 1 time keyboard lights went off, but I was able to still use it.. but ALL the lights are off. even NUM LOCK and CAPS lights are off.
Also 1 time happend that the lights were all on but I wasnt able to use the keyboard.. like the keys didnt respond.
 
Now I'm thinking that it might be a bios issue with the mobo ports and the pci-e usb's don't have enough power for the keyboard?
 
 

I have the same Issue with my new Z15 , no issues whatsoever with the previous Steel series KB on my Z590 MB and with the number of reports here on the Forum with the same issue my guess is it is a Firmware Issue with the KB.
 
The KB also seems to ignore the system and Unleashed repeat and repeat delay settings I am getting a lot of repeated
keys at all polling rates.
 
KB. 

I have two Z15 keyboards and love them. One keyboard has the "clicky" keys and I wish it didn't, (ordered that version by accident,) but otherwise they work fine. However, that was initially only true with the one attached to my Intel Z490 motherboard. The Z15 that I was running an X570 Crosshair mobo with a 5950X and the USB ports gave me nothing but nightmares (keyboard, mouse, USB drives... anything connected to USB). None of the "fixes" that were supposed to work actually worked. Both keyboards worked fine on my Intel system and neither one worked correctly on AMD. About 8 out of 10 times I had to unplug and replug my keyboard and mouse at first boot because the USB ports were buggy. Constant USB drive disconnects as well. I finally got fed up with that nonsense and rid myself of AMD. I went back to Intel and since then everything is fine.
 

jeff2cool31
I am having the same issue, I mailed back the keyboard 3 times and it still has the same issue.

Is it plugged directly into the back of the PC and are you getting any lighting to the keyboard when the system turns on? Also make sure it's directly into the back on a few different USB ports directly on the motherboard instead of a bracket with USB ports. It would be really odd for three keyboards all to be bad with the system without it being something else like a port that is not providing enough power. I always have had best luck with ports on the motherboard instead of any that are connected to a USB header.
 
Also for testing it might be good to disconnect anything using USB that isn't required to get the PC up and running like microphones, headsets, webcams and the like should be unplugged to see if possibly something else is not playing nicely.