Just wondering.. What admin mods are running on the server? You have SM (SourceMod) obviously, but are there any other?
Only Sourcemod, there is no other need for any other admin mods, and it opens up possible security holes in my opinion. I had some people try to use the "ManiAdminTakeover" and "SMAdminTakeover" exploit on the server before, but it got blocked by a special plugin our servers have.
Not going too much into detail, but I've seen a variant of the takeover a month ago on a server I host for someone where it could overwrite any file (like gameinfo.txt or server.cfg) with a folder of the same name, possibly rendering a server broken. We have a plugin installed that blocks all uploads, but still allows sprays to be used.