Over the past two days, the vehicle has intermittently displayed an Electronic Stability Control (ESC) system error message while driving. At the same time, the brake pedal becomes extremely hard to press, as if the brake booster or power assist is not functioning. When this occurs, it requires significantly increased force to slow or stop the vehicle, creating a serious safety hazard. The issue appears randomly and then resolves on its own. The vehicle starts normally, but the brake assist failure and ESC warning recur intermittently without warning. No modifications have been made to the braking system. I lightly tapped my house due to the sudden loss of braking power. No accident with another vehicle or person.