Http in nodes stop responding

I have had a few cases now where my "http in" nodes stop responding and will return a 400 saying something long the lines of "Cannot GET /some/endpoint". However, if I copy and paste the unresponsive node, and then delete the old one, it sudden starts working again. Is there anyway to stop this break from happening?

That can happen if something in your flow between the http-in and http-out nodes either fails to get the http-out to send a response or it takes too long. So put some debug nodes in along the flow to see what might be happening.