It is the middle of your maintenance window and you are updating Storefront Servers...
All of sudden, you receive one of those helpful errors that mean absolutely nothing to you!!!!
In my experience, all roads lead to the Telemetry service. I stop this service before any upgrade on Storefront Servers. It has fixed the issue and helped me finish my upgrade each time.
No clue, but at least if you run into this at 2 a.m. and you are really sleepy...you can try it and save you hours of researching via Google!!! You're welcome!!!