[Risolto] I am getting random 404 errors on the chinese version of our site

Background of the issue:
I am trying to access the Chinese version of our site, but we are encountering 404 errors. The errors are sporadic and disappear after refreshing the page a few times. We have tested this on multiple computers and different browsers, but the issue persists. Here is a link to a page where the issue can be seen: link nascosto

Symptoms:
I expected to see a working page as the page exists, but instead, I got a 404 error.

Questions:
Why are we getting 404 errors on the Chinese version of our site?
How can we resolve the sporadic 404 errors that randomly occur and sometimes disappear after refreshing?