Recently my sub has stopped working its been about 2 days since it quit hitting. But i've noticed when i hit a bump bass kicks in for a second or less so i started to mess around with it. I learned that if i press down on my amp which is mounted on top of my sub box that the sub begins to hit. Its screwed in so if i pull up on it and relieve the pressure the sub doesn't work. Any of you guys got a clue what im dealing with here?