I have been with this error for a week in this domain and in others that I have in Cloudflare. This error is not always comes out every few visits or time. I have contacted my hosting and everything works correctly we have carried out all kinds of tests.
uag=Mozilla/5.0 (Macintosh; Intel Mac OS X 10_15_7) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/100.0.4896.127 Safari/537.36
Do you have a screenshot of the 503 page? If it’s super basic and says “Cloudflare” then it’ll be something for support.
An “Error 503: Service Unavailable” with no Cloudflare in the message means you need to contact your hosting provider for assistance. It generally means your host is rate limiting requests to your site or that I’m Under Attack Mode has been enabled on the domain.
A “Error 503: Service Temporarily Unavailable” with “Cloudflare” means you are hitting a connection limit in a Cloudflare data center. When this happens, please contact Cloudflare Customer Support. Include as many of the details mentioned in the Quick Fix Ideas as possible.