Believe it or not, some ½ HP 10 GPM pumps can build more pressure than some 1 HP 20 GPM pumps. If the water level in the well is 130' or so, the 1 HP may only be able to build 52 PSI. If your pressure switch is set at 40/60, the pump just can't build enough pressure to shut itself off. This will cause the impellers to melt together or the motor to get hot and destroy the pump. Depending on which pump you have and how deep it is to water, it may not even be able to build 50 PSI and shut off. Turn your pressure switch down to 20/40 and see if it can shut off. If that is the case, you just need a pump that can build more pressure like a 1 HP 15 GPM pump.