GBX uses Amazon’s AWS cloud service to host the servers. There was an outage of their billing system a while back that effectively also took down huge swaths of their actual cloud servers, shuttering multiple web sites hosted on the system. Things got restored, and Amazon claims no data was lost, but the servers do seem to have been iffy since then. There was also the winter update though, which included a bunch of server side updates, so it’s also possible some unintended consequence there. And then there’s always the possibility that some doofus is deliberately targeting GBX game servers with some sort of attack, but who knows?