We are experiencing a very similar problem.
When you fetch a page as Google - it sometimes gets temporarily unreachable or even redirects to itself.
However, if you try to do it again - it gets fetched normally.
Redirects to itself: 24|690x266 .
List of urls with problems:
Even then page gets fetched correctly, there are still some problems with loading assets:
My thoughts are: We have 3 domain names:
api linked via Cloudflare with caching enabled.
All of them are different web servers and
s3 is definitely available since it’s just a file storage.
Since the problem is appearing time to time and Cloudflare is the only common among these three servers I would say that the problem is somewhere in Cloudflare.
I may try to temporarily disable Cloudflare to confirm it.