1 is because your hardware can no longer meet the requirements of your software.

2. The hardware is aging and can't reach the previous power.

Viruses, Trojans and other factors.

The game itself is not genuine. If it is a slimming transplant version, it will inevitably be unstable when running on different computers.

Externally, it is likely that the motherboard fan has too much dust and poor heat dissipation. Moreover, if it is smoothly turned on for more than 20 hours, the hardware is not a fever level. When running the game, the hardware performance will be greatly reduced.

If you play king of fighters with the simulator, it will be more stuck than playing king of fighters beaker without the simulator.