Browser shows black screen with white text (HTML)

We have been experiencing problems with our website for some time, which is running on WordPess. There is no error message in the debug log of WordPress as well as in the server logs. The problem therefore seems to be putting for the server (CDN).

The problem is that sometimes when we load the website the background of the browser becomes completely black, only HTML characters are loaded in white. See appendix. It is very difficult to simulate the situation, because it seems to be happening very randomly. We can’t find logic in it yet.

I am new with Cloudflare (CDN), what is the best path to walk in this or is this a known problem?

Are you using RocketLoader? Can you share the name of the domain?

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