Recently, I’ve been having trouble with Atom locking up and requiring a force-quit and relaunch.
For package development, I tend to run one instance in normal mode on the package source and another in development mode in a test repository, periodically using Ctrl-Option-Command-L to reload the development instance. On recent builds, though, about half of the time that I try to do this, both Atom instances lock up completely and i have to kill and relaunch everything.
I did grab the crash report on the off chance that it’s helpful.