I am currently using MTG 10.9.3.

I am continually getting a 504 error during simplification:

Simplification failed with the following error:

Unspecified error during upload: 504 "upstream request timeout"

Do you want to restart simplification again?

I have restarted numerous time at this point.

I have also started from scratch again.

What is up with this?

Are your servers having issues?