Got this synth from start of release. Reaper crashed after every single action (VSTi2/3 , AU doesn't matter) . It's work good in Ableton Live 9 and Logic Pro.
I have been using it for a long time. Occasionally, not in all projects. Works stably. I'm on Windows (from 7 to 11).
Are you talking about the latest version? I looked at the changelog, there are several fixes for crashes under MacOS.