Lost all of my tabs in 2 work spaces 3 times within 3 weeks. 2 times directly after crashes, the 3rd time after a clean close of the browser and system shutdown, to find all my tabs gone again 2 hours later after the next boot.
Obviously I have the option enabled to restore open tabs, as I did have for years. Otherwise why would people complain about missing tabs. I don't know why I am even writing this, like, just use your brain before commenting.
Before the Opera One update I did have crashes (though by far not as frequent) but I have never lost my open tabs in years. Before even looking into the crashes (they can always happen anyway), fix the tab restore feature, then crashes are at least not that bad.