Why does Days Gone stutter from 8ms to 45ms frame time during intense combat on Intel Core i5 12400F?

During intense group combat in Days Gone, frame generation time suddenly jumped from a stable 8ms to 45ms, which was fatal during critical moments. I tried disabling the camera device in Device Manager, which stabilized frame time but interrupted my live stream. I used GamePP Peripheral Driver Conflict Detector to set Razer Synapse to manual start and enabled hardware encoding priority in OBS. Frame generation interval converged to 7-12ms per RivaTuner, and OBS performance monitor confirmed frame rate fluctuation was eliminated.