I have checked the error logs for your domain on Cloudflare, and I can see that 522 errors were occurring, which means we were unable to connect to your origin:
What is interesting here is that the IPs that fail are consistent each time. For your reference, here are the top IPs of ours that experienced these errors:
172.70.246.192
172.70.246.193
172.69.71.126
172.69.71.125
This is a clear indication that some of the IPs in Cloudflare’s IP ranges are either being rate-limited or blocked by a network device at your hosting provider. Because Cloudflare operates as a reverse proxy, the IP address your server will see is one of a limited number of Cloudflare IPs. In that sense, many actual visitors may all come from the same IP address, which can cause firewalls or security software that is not appropriately allowlisting the Cloudflare IP ranges to block this traffic as it may see it as excessive or malicious. We publish a full list of our IP ranges here so that you can allowlist:
I would make sure that your hosting provider confirms that the Cloudflare IP ranges listed in the URL above are fully allowlisted from any security software, firewall, etc., to ensure there is no rate limiting or blocking of our edge servers.
This should ensure that Cloudflare can consistently make a connection to your origin server to retrieve content and serve it to your visitors.