I've been experiencing the same 502 problems. They do need to be remedied because it can't be encouraging to people who, you know, pay for memberships to the site, and these problems are the reason why I have abstained from going premium. I'm not thrilled about paying for something only to find myself unable to use it. That being said I'm more than happy with the site when it's working, gotten plenty of awesome mods for Skyrim and Oblivion over the years, I can't play vanilla anything anymore xD