Players kicked with "InvalidAuthSession" and "Kicked for Unresponsive"

Hello after the update players seem to load in walk around for a few seconds then crash. What could be the cause of this? I even changed from a custom map to a procedural map.. 

Could you provide any details, logs, errors?

Steam Status "InvalidAuthSession" 

Is the main reason they get kicked but I have seen "Kicked for Unresponsive" As well.