My workstations often receive the message "The trust relationship between this workstation and the primary domain failed" when users try to log in. I can fix this by rejoining the machine to the domain. My question is -- why does this happen? I have 500 workstations on a flat one vlan network. I have two domain controllers and they are running WIndows server 2012 and 2016. Any thoughts on how to keep this from happening more than it should be would be greatly appreciated.