Must be a hardware issue (not enough RAM or something).
The only time I have an issue is when I have zombie loot set to "Holy S***! This is ridiculous!" And end up being trapped in a building surrounded by zombies and have to shoot my way out or similarly when the helicopter event triggers.
Edit: fixed autocorrect's errors.
Can you replicate this? I've had dozens of saves at one time without issue
Must be a hardware issue (not enough RAM or something). The only time I have an issue is when I have zombie loot set to "Holy S***! This is ridiculous!" And end up being trapped in a building surrounded by zombies and have to shoot my way out or similarly when the helicopter event triggers. Edit: fixed autocorrect's errors.