I am not going to open a ticket as tech support probably have a stack higher than Eiffel Tower already.
First I was going to report that CA4 crashes every single time when I exit it (using CMD-Q or through Main Menu) - but after a few tests I discovered that it only appears to be doing it after being open for a while. My workflow is such that I usually keep the project open for a couple of days on end sometimes when I am working on it without closing the app. Then, when I close the app, it crashes. Well, technically speaking it doesn't "crash". It closes normally but then a few seconds later a crash report pops up. It does not seem to affect the project or the environment so next time everything opens without an issue.

It is not a show stopper and it's annoying more than anything. Other than that I find CA4 (the latest update anyway) to be quite stable which is very encouraging because when I first got it a few weeks ago it kept crashing on me randomly.

If I can detect any consistent pattern, I'll report back, but for now this is my best guess.

Again, I'm on 2017 Retina 4K iMac on Mojave 10.14.4