APF strangely blocks 443 port with specific time interval

I run on CentOS cloud server. Recently I installed SSL and enabled https for my site. After enabling https every 20-24 hours APF blocks 443 port but 80 is accessible as usual. After I restart APF 443 can be accessible for another 20-24 hours. 443 port is enabled in the APF config. Any help or direction highly appreciated.

Thanks.