I'm getting a "400 Bad Request cloudflare-nginx" error

Hi I’m getting an error through all my website, but it happens sparingly, only to disappear a few minutes later, and to come back a few days later. It affects the whole website and all users, admin and non-admin.

The error is a blank page with the message: 400 Bad Request Cloudflare-nginx

Has anyone encountered this issue before? How can I solve it, and what may be causing it?

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