It appears as if the timeout between api frontend and backend has been drastically reduced. Whereas before (on some cases with very large report sizes) it used to take up to 5 minutes for the API frontend to wait and then return the error ERROR_GETTING_RESPONSE_FROM_BACKEND, it now only takes approx. 20 seconds.
Hence we see a lot more of those backend timeout errors. And where before a retry after a few minutes generally succeeded, all subsequent retries now fail as well.
The problem with such a low timeout is, we cannot even download a list of all adgroups for some accounts, esp. where adgroup count is >100k.
Can someone from Google confirm this new timeout policy? Or is it just a temporary glitch that will be fixed?