Hello everyone,
I've the same problem since three weeks, and with my main account (!!).
I tried everything possible, restarting the sim (thanks for the very helpful sim's admin), sending me IM/1L$, changing my password, changing viewers, forcing the log in (it works once) but now i'm still unable to log in with this acc, Lindens dont even read my 12 tickets,and when i call them, they only say "we restarted the sim and the issue remains, we're still working on this".
I'm pissed off, really. I'm glad that i didnt bought a premium account yet, because i don't want to pay for this very poor service.
Okay i'm now back inworld, but i think it'll crash again. lol
If you have this problem now, just know that you've nothing to do, just wait alone because lindens are quick at banning/sending age verification only.