This is the issue:
randomly my PC start to lag and
top shows a 100% usage for Xorg.
Now, I know that it couldn' be Xorg itself the problem but a call from a client. So I killed everything, one by one, finding that it's unity-control-center's fault even if its window is not open.
so i did
and after a while it comes again like magic!
Here's my specs:
Distributor ID: Ubuntu
Description: Ubuntu 16.04.4 LTS
CPU: Intel Core i7-4790
GPU: GeForce GTX 1060 6GB
RAM: 8GB (7.7 GiB)
Tell me if you need more info. Any help will be appreciated.
Thanks in advance.