Well, my game dropped out a short time ago with a CTD, and now I get the bad username/password nonsense.
So I come here to check it's not just me (I thought it may be an open log-in session that needed to time-out on the server), but no, I see problems all round again.
It seems the only time I get a CTD is when the server collapses, which makes it even more annoying! It should
pause and save, as is
supposed to happen if the connection drops. Instead, it just dies and I lose all progress since the last autosave.

I'd literally just hit a ship with my last torpedo as well
Anyway, I dropped out with the CTD at 20:00 GMT (my torpedo hit at 19:59 because I made a screenshot, lol), but have been playing all evening up until that point.
I could even cope with the periods of not being able to play due to DoS attacks and other outages that are hard to 'plan for', but at least make the autosave system work properly!!!!
EDIT: Managed to get back in at 20:20 (though savegames could not synchronise), but I decided to quit instead of carrying on playing for now.