TLDR : Fans randomly start spinning like crazy and calm down only if I close the lid.
Hello there !
At work, I have a MacBook Pro 15" mid-2015 (2,5GHz Intel Core i7, 16Gb 1600MHz DDR3). I have basically the same apps open all day long and it works fine with the CPU at roughly 50°C.
A few times a day, while I minded my business and doing nothing in particular, then fans start spinning very loudly (but the CPU temperature stays the same).
The first times it happened I thought there was something like the time machine working in the background but I checked and its not. Moreover, if I bear with it and don't do anything, they keep spinning like crazy for hours and never seem to calm down.
The weird part is : If I close the lid of my computer (which is plugged to another screen, so it doesn't shut down or anything), the fans calm down slowly. If I open the lid again while they're calming or when they're done, the problem doesn't come back immediately (but will eventually, a few hours later).
I've read about people having fans spinning WHEN closing the lid, but I don't know what to do about this problem in particular.
Any idea ? :D