@Rip, that avenue has been looked at, so unlikely.
@Boomer, we introduced more protection for anticheat in recent months, so again unlikely. However, I did ask the question if the servers that were having issues, were they directly streaming to pbbans, or via the text file system. I don't know.
I could look at the ultrastats as a last resort, to see if the cronjobs are causing issues, however we would be experiencing this on all servers reporting Ultrastats, which isn't the case.
I still believe it must be a game host change or a problem with the mod. Again however, Rugger said the mod hadn't changed and we didn't get this problem before. So if we are experiencing this on many server which are hosted by the same game host, I think that is an avenue that needs to be looked at.