So i have this wierd problem with my blackwidow V4 pro. After i cold boot my pc the lightning on my keyborad does not work, keys are working fine but there is no light not even numlock diod for example. Only thing that can fix it is reboot the pc or unplug the keyborad. I already tried clean synapse reinstal or diferent usb slot but every time keyborad works fine for like week or two and the that problem is back. Every other devices works without any problems. And i also have no issue with my previous keyborad ( Hunstam Elite ).