Random connection drops

Haproxy: 1.5.18 (on centos 7) normal install

We have a system that runs two httpd servers.
The random connection drops is, random. sometimes one week after, sometimes two weeks after. but when it happened, the connection drops. It was as if “port 80” doesn’t exists.

Temporary solution:
restart web servers. restart haproxy.

Does anyone has similar issue, and how to solve this? have searched through the logs, but found nothing.

Provide the entire configuration, the output of haproxy -vv and dmesg.