Maybe the same issue but maybe not the same cause. I hope you posted your problem in a new thread and posted relevant information, espeically the logfile.I have the same exact issue. I can play for about an hour or 1.5 hours and my pc will lock up.
Ok lets see if we can figure it out this time. This has been happening since Alpha 18 launch and I gave up because I couldn't fix it. Alpha 19 experimental is doing the same thing but this is one of my favorite games on Steam. Anytime I try to play 7DTD after a couple of minutes my pc locks up completely. It's a complete freeze that I have to manually power down and back on. It happens every time and it ONLY happens on 7DTD. I've tried different things from driver updates/rollbacks, forcing directx 10, and complete fresh installs of game and windows. Same thing happens every time. There is no error log anywhere to be found. My temps never get above 80C. Any help would be greatly appreciated.
https://pastebin.com/NStGXcTL <----output log.
Random observations:
In the logfile the exe is called with "-force-feature-level-10-0". Is there a reason for that? Could be a remnant parameter once set in the launcher.
The errors reading the world header should not happen with a new world. Could it be that an anti-virus program is interfering?