The 404 errors are not happening on every page load, but coming up every minute or two. A refresh will usually load the full page correctly. When it does go to a 404, it shows a very basic 404 page, not the usual custom Google 404 page we have seen before.
So it is definitely impacting multiple countries.
There is also a thread on the Google Webmaster Help forums.
It isn’t a major problem since a reload resolves it, but it is never a good sign when a service starts throwing 404s instead of loading the correct page and data.
Update: The problem has been fixed.
Jennifer Slegg
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