My SSD Hard Disk freezes intermittently.

Too bad there is no such setting or icon in my system preferences. I see have two sliders ‘computer sleep’ and ‘display sleep’, however no icons. 

Also, I wonder if disabling the nVidia doesn’t affect performances? I regularly use it for editing video so I need all the power I can get. 

Another thing is the SSD started making strange sisling noises, kinda like old hard drives did after a while. 

Thanks!