HTTP ERROR 500 on all Cloudflare based websites

Yesterday 29th January 2020 we lost all our websites listed on Cloudflare. Each of the four websites now show httpError 500. Has this happened to anyone else and any suggestions please ?

What do you see in your account? Are the domains still listed?

We have had to remove the site’s and rename the name servers back to our own servers, as a quick fix. Just waiting on reg123 to in act the server change to see if this resolves the issue Dave,