I literally just registered this account today to echo that I'm having the same problem that you seem to be describing, only mine is with the K70 LUX RGB.
It only seemed to have started when I switched to the iCUE beta around when Far Cry 5 came out. I have tried different USB ports. I have even tried switching to different polling rates using the switch next to the cord. None of it works.
It just blinks or flickers once every half a minute to a minute. It seems to flicker to whatever background static color you have applied to the device. In my case, it flickers from a few static colors to the blue static color I have saved to the device. I'm using the attached custom profile. Orange_And_Purple.cueprofile