I understand this thread is a few months old now but I decided to share how I fixed my issue with the Cooler disconnecting/reconnecting.
I have a Corsair H100i GTX Cooler. After staying up til 4am (I started getting this issue after a bios update), I figured out what was wrong. The bios pump fan was set to auto.
What I did was set my pump and cpu fan to PWM. This will cause your fans to go full blast while you are in the BIOS. Save your settings and reboot into Windows. After that, I set my corsair link profile settings to Quiet and the Fans went back to normal (before I did the BIOS update). You may set your profile settings to fit your needs of what you are doing.
Since doing this, I haven't had an issue of the cooler disconnecting/reconnecting.
