Lately I've been having a lot of difficulty accessing a2k and also posting responses. I succeed perhaps once in 8 or 10 tries. This applies whether I click on the link in an email notice, try using the URL directly, or going through my Favorite>Reference link.
This has resulted (as jespah knows) in multiple posting since sometimes I have succeeded, but didn't know it. Mostly, the connection simply isn't made.
I've also had trouble going from a posting to Comments.
Is it me or a2k - I haven't had this problem with any other site.