Cloudflare is quite strange from yesterday to today

Hello. I’m using Cloudflare for my origin server for a month. Everything works fine until yesterday.
First of all, all request to rest api is success. After 5 minutes, all requests to rest api is stuck forever

Then i double check the origin server immediately, the request from that is still success. After 5 minutes, the response is success again. The request via Cloudflare is not stable for now, sometimes success and sometimes pending to timeout.
I also add whitelist IP ranges to my origin server using Ubuntu but it is not working
Some my Cloudflare setup:

  • DNS A Record with Proxy Status is Proxied
  • I don’t add any firewall rules
  • My SSL/TLS encryption mode is Flexible
    How can i fix it ? Thank you

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