Hi all, we have so far been unable to reproduce the problem on our end. We're using Cubase 10.5.20 with BB 734 and plugin 2.12.15 without issues, perfectly stable.
Are you using an external audio interface or just your internal sound card? Can you tell us which Windows build you're using? Right click on the Start menu and choose Run, then enter in winver and press enter. What version number and build number are showing there?
Previous versions of Windows 10 had trouble with a lot of audio software - in particular, Windows 10 versions 1903 and 1909 were not great. We suggest Windows 10 version 2004, which should be available in Windows Update.