For me, Emacs on Mac OS is not all that stable. I see a freeze about twice a month, which is not "very rarely" in my book. It also leaks memory, albeit now (in the upcoming version) less so. (Disclaimer: I am a heavy user and contributor.)
What version of Emacs are you using? I stopped using Mitsuharu port because of its weird behaviors and instability and been using plain GNU/Emacs - typically I install it via emacs-plus homebrew formula. It's been very stable for me for the past few years.
