I'm using rMBP 13" mid-2014 and I'm NOT updating to High Sierra, but even good old Sierra is not as stable as older versions of MacOS.
Sometimes I can't play videos, I press play and nothing happens, YouTube, Vimeo, Netflix, everything is down. Usually restarting browser(s) helped and normally it happened only in one browser at a time but a few minutes ago I had to restart my Mac, because every single browser I have (Chrome, Opera, Safari, Firefox) couldn't play a thing and restarting them did nothing.
Is it a known issue? How to fix that?