Thanks Pokey
The fact that it has happened to an unknown, but significant number of people. (Who knows how many can no longer access the site to tell us they have been banned?) is odd, and suggestive of a site issue?
It’s on my late model, up to date iPhone that I’m experiencing the issue - I thought they were a little immune to most of these “cookie” type issues. “Resetting” would lose me a lot of stuff, even clearing all the temp files would mean logging in to a heap of sites etc again. (Not the end of the world, but not ideal.)