Staff member posted in another topic that right now it's a known issue.
For reference though, most of the mods/admins (if not all) check for the presence of the ad CODE, not the ad itself, especially since the ad doesn't come from the same source as the content on the page. There's the chance the ad server is down, so they shouldn't be suspending by that.
I say shouldn't because I'm not a mod/admin, so I don't know how they do things. I do recall it being said that they check for the code itself though.