It seams to me Opera is anything but a browser lately.
After being unable to use it as a real browser due to the Out of Memory error (https://forums.opera.com/topic/17877/new-version-out-of-memory-issue) on a 16GB RAM PC, now Opera started to freeze, crashes and looses the session. And because it uses the shitty Chromium engine, managing the session is a real mess. Opera Sync does not work of course. It never did and when it actually did something it only messed up the session,
Of course, I'm expecting anyone here to give a damn about this issue, it's not like anyone cared about this browser lately but hey, maybe I am lucky and reporting a problem will actually get it fixed :|