Not sure where to ask for help, or have an idea what is happening.
This is a rare issue, I've experienced this 4 or 5 times in the last year. I'll be at the computer, either watching YT, browsing, or playing video games .. and Windows Aero turns off. It stays off for a minute or so, and comes back on. It's kinda like if someone/something is RDC, but my desktop BG images stay.
I have Malwarebytes Anti-Malware subscription, I use Panda Free AV, I use Chromium with many privacy & security type addons.
Speccy Info: http://pasted.co/13abbe6e