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.
OS Name: Microsoft Windows 10 Home
Version: 10.0.18362 Build 18362
System Type: x64-based PC
Processor: AMD Phenom(tm) II X4 965 Processor, 3400 Mhz, 4 Core(s), 4 Logical Processor(s)
BIOS Version/Date: American Megatrends Inc. P1.40, 3/27/2012
SMBIOS Version 2.6
Embedded Controller Version: 255.255
BIOS Mode: Legacy
BaseBoard Manufacturer: ASRock
BaseBoard Product: 970 Extreme3
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.