I'm new to this myself. I've had similar problems with a JP and a LW3. I've somehow broken wires off while working on something else under the play field etc. Moving machines shakes things loose. If there's a shaker motor in you JP, tune in down to lower shaking. Overall, it DOES settle down once you've fixed those first few inevitable problems, and you will go months at a time without having to pull the glass for repairs.