If you don't want to download third-party files, you can manually force the game to run on a single CPU core, which is often the cause of the glitch. Launch GTA San Andreas and out of the game.
If the mouse stops working suddenly while playing, try these quick steps: I'm having trouble with san andreas and my mouse. : r/GTA If you don't want to download third-party files,
: Search for DINPUT8.dll for GTA SA on trusted sites like Speedrun.com or GitHub . If you don't want to download third-party files,