I have a Cooler Master Nepton 240m with an Asus Z170-A MB and a Skylake CPU. The rattling has stopped and it seemed to work fine, but twice now the pump has stopped and my CPU was almost fried. I checked in the Asus AI Suite - the water pump was really not running. Both times when I shut the PC down and later restarted it, the pump seemed to work again and temperatures were back to 30-34Â°C. Has anybody had a similar problem? Do I need to RMA? I really can't wait for an RMA to come back... so I guess I would have to buy an alternative cooler, which is annoying, as I really liked this one.