Frequent Error [500] documents service is unavailable

I’m working on updating a 21,000 rows in an app. Since there is no import functionality that allows me to map to existing values the only option for me is the API. I’m using integromat to search and update records.
The largest barrier here seems to be Fibery. I am frequently encountering the error
[500] documents service is unavailable
And I’ve also run into JWT error. These occour in scenarios that otherwise run fine.
Instead of “setting and forgetting” a major update of information I’m left babysitting scripts to make sure errors don’t result in an incomplete update