Mdaemon 19.5.5 Local and Remote queue stuck

After few days I patched the server with the 19.5.5 version I am having an issue almost everyday. The server do not release emails, all of them get stuck in local and remote queues.
In the logs the only I can see is:
In SMTP (in): Error or timeout during Spam Filter processing
Antispam.log shows many entries like this: c:\mdaemon\queues\temp\md50000003188.tmp
Nothing in antivirus log.
I enable debugging in MDSpamD log but when the error start it stop logging.
To fix this I need to hard reset the server because MDSpamD.exe cannot be terminated.
The system is 64bits running in Windows 2012.
Hope anyone can help me with this.

Thanks!

Attachments:

MDaemon-2020-04-06-AntiSpam.zip (479 KB)