On the UT project update today, they announced a new build a little earlier than usual (Fridays are typical). This is primarily to stabilize servers and HUBs.
The Unreal Carnage UT4 Hub is back up and running tonight so hopefully it stays stable. There were instance lockout problems and memory leaks that were causing the previous version to crash.
If you can, please leave feedback on the forum on this site if there are issues or requests.