WebStorm 2017.3.4, Windows 10. Starting today, before I upgraded from 2017.1.x to 2017.3.4, WebStorm started going out do lunch while debugging. I made a video:
At least, I think it's WebStorm. Node.js is consuming all the CPU. But only while debugging, not when just running outside the debugger.
I tried following instructions to take a CPU snapshot, but it caused WebStorm not to be able to launch. Maybe I'll try again.