My subwoofer was cutting out and finally went off. I took off the panel which housed the amplifier circuit boards. As I was doing this, music was playing, and the subwoofer would play then not, and so on. I saw no damage. However, I took something nonconductive (used a pen) and tapped down on a relay. Now the subwoofer has been working for about 30 minutes. Here was my logical conclusion for why it was the relay. The amplifier circuit worked sometimes, and sometimes it did not. That led me to conclude that it was either a loose connection or a relay (basically, anything mechanical, resistors/capacitors shouldn't sometimes work and sometimes not, they die). But my question is, why did tapping on a relay fix it for good?