We get erratic 520 error messages via Cloudflare. Sometimes a page loads okay, sometimes it does not. That is the same for every page on our site. Once we update the error message, the page loads okay.
We have now cancelled CDN on our server to get rid of this problem, but the 520 error messages continue to appear.
According to our hosting provider everything works.
This is just one Ray-ID of 520 error messages we get. Sometimes the page loads okay, sometimes it does not. That happens to all our pages.
Ray-ID: 56a3987adecd96f2 (this corresponds with the error message in the screenshot)