Crypton

Been having this same exact issue with the K70. Just posted about it here: https://forum.corsair.com/forums/showthread.php?t=185077

Have this same issue with the K70 RGB Mk.2 Rapidfire (Low Profile). I have to unplug the keyboard USB and plug it back in before iQUE will recognize it. Have had this issue since the day I purchased the keyboard which was only a couple months ago. Keyboard still functions in Windows when it happens and can use it as normal, but all light controls stop and the keyboard keys all light up red but do not change. iQUE will show no devices detected. I have tried updating/forcing update of firmware as well as holding ESC and resetting the keyboard but does not fix the issue. I have tried uninstalling/reinstalling iQUE as well as simply exiting iQUE and loading it back up but still no luck. I recently reinstalled Windows 2 days ago (not because of any issue, but because I wipe clean every few months) but still the issue persists. I previously purchased a K68 Cherry MX Red and never had this issue but I wanted the lower profile as I am more used to that.