yes i have. my server works fine with no issues. there are no ssl issues, no firewall issues, cloudflare ip’s are whitelisted in csf, i use litespeed web server with increased limits, there is no caching in wordpress, i dont use litespeed plugin. everything is working. but cloudflare not.
when i pause the site for 30 minutes and i clear cache via the wordpress apo plugin then it works again. i really have read all related articles but nothing helped.
i am confident that something is happening with APO. when i refresh my site 5-6 times it loads. all other times i get broken css and Error 520 Ray ID: 66025809573738db • 2021-06-16 07:32:22 UTC
Web server is returning an unknown error
If you’re seeing 520 errors that means your origin is returning something unexpected to us - the best thing to do here would be to log the cf-ray header in your origin server access logs and check the RayID from a 520 you see with the logs on your origin.
Most likely your origin is resetting the TCP connection (most common) for some reason or is returning large origin headers (less common, but still a possibility).
You need to identify why it is happening first - using the steps suggested - add the cf-ray header to your logs and check your access & error logs on the origin server when you see a 520 happening - that should reveal what is happening at the origin to cause us to return this error.