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So after updating, I havent encountered the bug again. However, since last update I have upgraded my pc and so reinstalled windows. Which has me thinking it could be a file that might get corrupted or deleted after every up date? Not really too sure, I just know that for me reinstalling windows hopefully has fixed it
@playwolf haven't updated my opera just yet as I was trying to avoid this bug haha. Will keep this in mind, hopefully this bug gets fixed soon as its one of the most annoying bugs to exist 
@playwolf Hi, I also get this same issue and the only fix is like you said to just re-install it. its getting quite annoying now, been happening for a few months but can't seem to find anything about it anywhere. I did submit a bug ticket, and was told they are aware of the bug and that they are working on it, but it seems it doesn't affect everyone as I'm sure they would have pushed a fix out by now.