Prototype 2 often fails to save or crashes on modern PCs with more than 4 or 8 cores.

is notorious for crashing or failing tasks on modern CPUs with many cores (more than 4 or 8). This instability can sometimes interfere with the save process. Temporary Fix: While the game is running, open Task Manager , go to the tab, right-click prototype2.exe Set Affinity , and uncheck all but 4 CPU cores. Permanent Fix: Use a community mod like the Prototype2Fix on PCGamingWiki , which automates these stability fixes. 5. Clear Old Save Data

Here’s a complete review of the most effective fixes for the error on PC (Steam, typically Windows 10/11).