GraphQL Analytics API - random errors and timeouts


I’m using GraphQL Analytics API to retrieve data for all domains in my account.
I’m counting pageViews after retrieving 90 days of httpRequests1dGroups for every domain (my domains are Free).

The problem is that randomly my requests either return “Internal server error” almost immediately, or “upstream request timeout” or “stream timeout” after 30 seconds.
Sometimes it works and I get correct data, sometimes it doesn’t and I get errors.
I’m well within the limits listed on

Are there perhaps other, undocumented limits, that I’m exceeding?
Did anyone have any success when requesting data for large batches of httpRequests1dGroups ?
I also have some suspicions that requesting data for a period containing date before a domain was active is problematic.

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