AdWords API Python - Internal Error or Parsing Error

See code with commented errors here- https://gist.github.com/tejasmanohar/bff2fe3360673a823d31484a130d4bd8

We're seeing this error consistently (every single run) for one customer when fetching their Campaign Performance Reports. We stream 1 report per campaign so that we can filter from the campaign's start time onwards. I feel as though both errors are from the same source and the CSV parsing one is just occurring because some sort of non-CSV error is returned.

Could it be a load issue? How should we proceed? Given an email address of someone from the AdWords API team, I can send over additional information about the customer / request that's failing to narrow things down.

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