Hi,
Sorry I'm on my mobile so can't provide a full report.
I'm getting error mails from watchdog regarding clamd.
That's the log from clamd

Updated yesterday
Thanks!
Did you check line 21 of clamd.conf?
ExcludePua Packed
changed to
ExcludePUA Packed
Now working
Oh, I was expecting a file format error. Didn't catch the Pua.
Has to reopen. The can't move errors crashed it again

Just restart watchdog-mailcow. It kept the kill in the queue. It checks the thresholds at the beginning of a loop, then sleeps and THEN kills. That's something I need to change, you will not really notice it for other checks, but clamd-mailcow has a high-sleep check, so the kill is delayed a lot.
I already fixed the "busy" errors, but not pushed into master. It is nothing that prevents ClamAV from starting, don't worry.