After expired my NameCheap SSL certificate, I config my website with cloud flare and install the Cloudflare SSL certificate. now my website not loading. it takes like 2-5 mins to load. but website without css and some images.
website worked perfectly before use Cloudflare SSL certificate.
Currently, SSL/TLS encryption mode is set as Full,
If I set it to Flexible, there has an error message " This page isn’t working" “ERR_TOO_MANY_REDIRECTS” in google chrome.
That’s an issue. You either need to renew that certificate or get any other valid certificate onto your server (Cloudflare for example offers Origin certificates, the search has more on that). Also make sure your encryption mode is “Full strict” and not just “Full”.
As I already mentioned, you need to renew that first. And no, your developer is wrong, Cloudflare does not provide such a certificate, you still need a certificate on your server too. Maybe a new developer