Ok, lets see if I can help you. Problems happened on the last version before the recent patch and then after as well. Current version: v1.0.3 (32306)
This was on SURVIVAL mode, but one of my friends had this problem playing on story mode after a crash.
One of 2 scenarios happened and resulted in a lost game:
- After a crash, when entering/leaving a building holding a lit up lantern on my hand. I got blue screen, restarted the game, game wouldn't read my save file (which was on the HDD with the same file size as other saves and no corrupted icon or any indication of corruption). Was carrying a lot of items with me (around 40kg). This happened twice.
- After I exited the game normally to upload my save to the cloud (hoping to have a backup in case something went wrong). I started by forcing a save (entering/leaving a cabin) and then quit the game, loaded the game again to check if I could resume, and the game just didn't want to read my save anymore. This happened 3 times already.
So as far as I can tell, they could be completely unrelated problems that result in the same outcome (stops reading save file), OR, the crash just forces me to re-open the game and realize my save was already gone in the first place.
On all cases, I was over 14 days survived when the problems happened.
My other friends playing with me over PSN chat, had the same problems stated above, both with around 7-8 games lost each. Either crash and save is gone, or quit the game to make a backup and the save is also gone.
If you need the save files (.bin) those could be provided as well as I made a backup on my pen drive.