It looked like you have the issue on multiple hosts - in that case a potential issue could be that your server contained things in its name or description that gets filtered by the master server, due to violating our ToS. If such stuff is in there, the server will be delisted.
If it was a thing only on one host, that's very unlikely of course. To further diagnose I do need a running server and it's IP / ID though, otherwise I cannot check what we got on the master server.