I am currently having this issue. I watch a show on one monitor and surf the internet on other monitors and every few times I open and close tabs Opera drops out the show. I have to reload the show and restart it each time it does this. Very annoying.
I watch shows on a variety of platforms and it happens to all platforms. I watch whatever the lowest quality is generally 360p or 720p as internet out here only goes up to 20mbps. I have snoozing tabs to save memory turned off, and I tried turned on neither seems to make a difference on the dropping out videos.