Sometimes my heart randomly stops?

sounds like you have a dysrhythmia, when your heart beats irregularly. If teh pain is located directly beneath your chest bone it could be ischemic pain (meaning your heart muscle is not getting enough oxygen becaus e of the skipped beat) If tis occurs at rest you should go to your doctor adn get checked out. They will probably do and EKG to see your heart rhythm. Irregular heart beats can be very common, they prescribe medications to help regulate this. Hope this helps