I recently got an h100i v2 and sometimes when I wake the computer from sleep, the pump noise makes a loud mid octave grinding noise, so loud that I can hear it outside my h440 (~50 ish db.) A restart fixes the issue. Another minor issue is that at times, the thing will show up in corsair link (I never use it anymore), but the LED's and fan profiles won't change. Again, a restart fixes it. I've switched around USB headers and the issue still persists. The plugs are fully plugged in to their respective headers. and the USB headers work.