C2 is the the latest 277 64-bit, installed the latest NW.js version last night and still had the issue crop up a few times. ...
NW.js version affected have been all since about 0.30.4. I say "all" but I update NW.js sporadically, so it's more like all that I've tried since 0.30.4. Before that version, the issue was a lot more frequent (almost every time I started up NW.js), and when my PC would hang up it seemed to last longer. A strange issue indeed.
Your hardware seems fine, unless you run a system with less than 1gb memory available. If the package.json files are not edited, then it's not that either. I would check if your antivirus software, perhaps blocks NWjs at some point.
If nothing helps, you could try to remove the temporally preview folder that NWjs creates [E.g. C:\Users\YOURNAMEHERE\AppData\Local\PROJECTNAME (preview)]. NWjs preview savedata is marked with (preview) next to the project name. This will remove any game specific savedata.
Example: