I am having the 404 error as well, and got an error in trying to "like" a post.
ETA: And errors all over the place trying to post to this thread. It finally worked on the third try, then getting back
to the thread was all wacky.
Every night for me around 12:30, I cannot access the site due to a database error. I don't think I've ever mentioned it before. It's a pain.
I know regular maintenance is important, but can't they pick a better time, when the fewest users are online? When it's 12:30 here, it's 10:30pm on the west coast of the U.S. Seems like that wouldn't be a low traffic time of day. Or maybe it is, I dunno.