Site loading too slow and site serving by uncached bandwidth only

Over the last 6 hours 77% of your requests have been served from cache. Over the last week 72% of requests have been.

Currently your origin LB is returning 502 bad gateway to requests.

curl -Ik --resolve
HTTP/1.1 502 Bad Gateway
Date: Thu, 23 Aug 2018 15:12:48 GMT
Content-Type: text/html
Content-Length: 182
Connection: keep-alive
Server: nginx/1.10.3 (Ubuntu)

Cloudflare would get the same response when attempting to connect to your origin, not sure what is wrong there, but it’s an origin issue.