Unable to find proxy or error page not found

I have created a new account and deployed all my proxies.But after a couple of days all the proxies responded with below message.When i logged in checked all my proxies undeployed which i did not do.I did deploy them again ,then they started to work .How did that happen?Proxies are not responded well these days all proxies in my old account did good.But the proxies in new account sometimes they work sometime they do not . @Dino-at-Google

{"fault":{"faultstring":"Unable to identify proxy for host: default and url: \/v2\/pinterest\/v1\/me\/boards\/","detail":{"errorcode":"messaging.adaptors.http.flow.ApplicationNotFound"}}}
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@archana

The 404 error could occur due to multiple reasons. Since the issue is no longer happening, it might be difficult to determine the actual cause of the issue.

However, if the issue does re-occur, please follow the instructions in "404 Unable to identify proxy for host" playbook to troubleshoot the issue.

If the issue persists, please contact Apigee Support.