What causes this error to happen?

I will be successfully running multi-user mode for a month or so and then all of a sudden I will get;

"Error codes: (-6190, -816)."

During this time, the other computer says that it is running in Multi-User Mode.

I then go to my server and run the Tool Hub and any other instructions I find with the community. I get it all reconfigured and running properly, and then sometime later it happens again...

Pretty frustrating when I should be more focused on my day to day operations