Daemon restarts randomly

I seem to remember this issue from some years ago but cannot remember the solution.
I have recently updated my Centos 7 server as part of a move to Rocky..
Since the upgrade, amavisd randomly stops and restarts.
There is no real error message and every iteration works as expected.


Any suggestions gratefully received.

Cheers,
Stephen

Apr  2 03:09:57 mustang amavis[1189]: sd_notify (no socket): STOPPING=1\nSTATUS=
Server rundown, notifying child processes.
Apr  2 03:09:57 mustang amavis[1189]: Net::Server: 2023/04/02-03:09:57 Server cl
osing!
Apr  2 03:09:57 mustang amavis[1189]: sd_notify (no socket): STATUS=Child proces
ses have been stopped.
Apr  2 03:09:58 mustang amavis[2436]: logging initialized, log level 3, syslog:
amavis.mail
Apr  2 03:09:58 mustang amavis[2436]: sd_notify (no socket): STATUS=Config files
 have been read, modules loaded.
Apr  2 03:09:58 mustang amavis[2436]: starting. /usr/sbin/amavisd at mustang.sdc
.com.au amavisd-new-2.12.0 (20190725), Unicode aware, LANG="en_US.UTF-8"