Ive had the NA red magic 5g for the past few months. Cooling fan just started to act up....wasnt coming on at all during gaming or 55w charging...however i could see the phone software was commanding it on because the fan icon was visible in the notification bar. My guess was that either the fan motor is starting to fail and/ or they maybe hair, dirt,etc logged around fan cavity preventing motor from spinning. I was able to get the fan to operate again by plugging phone into 55w charger and blow through air intake cooling port with my mouth several times. So far so good. Ill keep this thread posted if it becomes inoperable again.