I'll add my voice to this request too. Mattercontrol will unexpectedly quit on long prints. It's possible to resume but all progress info is lost. My machine is a Late-2014 iMac 27" (Retina 5K) with 16GB RAM.
Posts made by klmullen
RE: unstable on Mac?
I had a similar problem on my Mac. Eventually it stopped responding completely. I could still send commands using the Arduino IDE's serial monitor so I know the printer was communicating. I could also use MatterControl using another Mac.
I ended up deleting the app and deleting the contents of the MatterControl folder at '~/.local/share/MatterControl' then re-installing the current version of MatterControl. That seems to have fixed it for now. I did have to go back a re-create my customizations so if yours are extensive you may want to go back and document those before deleting.