I have a server which has been running for several years without any issues. However in the past month it has gone down about 5 times now. I think it has something to do with php7.2-fpm as the simple "fix" is to simply reboot it: systemctl restart php7.2-fpm

However I'd like to work out why this is happening and if there is a more permanent fix I can do to stop it.

The Apache error log looks like this:

[Wed Aug 18 22:07:05.165386 2021] [proxy_fcgi:error] [pid 9835:tid 140657754629888] (70007)The timeout specified has expired: [client 141.101.107.166:28564] AH01075: Error dispatching request to : (polling)