This is the most common solution.
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 prototype 2 failed to save data fix
