I hate to say it, but coming from many years of working in technology, the best thing to do is become a nag and eliminate all opportunity for the issue to be blamed on your machine or network.
You can demonstrate the capability of your PC by taking screenshots of file integrity validation in Steam, your PC details (CPU, RAM, GPU, OS).
With this information readied, you can also pull up an internet speed test to trigger when an issue occurs.
When the issue occurs, grab debug info ([F1], Copy Debug Information) and trigger the speed test- screenshot that too.
Put it all in an email to email@example.com and hit send. This will (hopefully) demonstrate that a perfectly adequate machine with a perfectly adequate connection running proper software is having issues with Monumental’s servers or connection.
It is also important to open a separate ticket for each occurance. If the lag happens 12 times in an hour, it should be 12 separate emails.
Monumental will combine the tickets of course, but this ensures documentation of how frequent the issue is.
Lastly, we all should be doing this. Its easy to be complacent and expect that someone else will report as we muddle through it, but it only masks the true impact of the issue.
I know its a pita and I can’t even say that I have enough discipline to do this every time, but I’m going to try.
I doubt this will work for console players.