To verify, you've upgraded from 17.0.3 to 17.5.0? Or do you mean 19.0.3 to 19.5.0? If you're running version 17.0 or 17.5, I would recommend an upgrade to a newer version, if not the latest.
If you are referring to 19.5.0, does the issue occur at all times or only during busy/slow points during the day?
Was there a particular reason the 32-bit version of MDaemon is running? If you run the 64-bit installer of MDaemon 19.5.0 (available on our Downloads page), does the issue persist?
https://www.altn.com/Downloads/MDaemon-Mail-Server-Free-Trial/ If you're still having issues, can you submit a support request in the link in my signature and a technician can further review your issue?
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Tyler Davis
MDaemon Technologies
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