Unresponsive iMessages and FaceTime on Mojave I have this issue with Messages, FaceTime when it gets unresponsive on start. Same issue was with Contacts, but following some recommendations on the web i've reset the Contacts database and it works now. But with messages/facetime no luck, tried many solutions, resetting nvram/pram, deleting configs and databases, etc.

Is there a way to reinstall iMessages and FaceTime completely?
Have you tried deleting files in the ~/Library/ folder? ('~/' means your user folder)
search facetime there, try deleting what you find.
It might sign you out, at the same time it might solve your problem.
You can search 'Messages' there as well.

I don't guarantee it won't do any harm. Yet it's what I usually do when I run into problems. It's sort of DIY mentality.

If you don't see the Library folder, it's because it's hidden by default.
You can change that in "Show View Options" menu in "View" option of Finder. Or by pressing command and j at the same time. (You should be at ~/ for this option to be shown).