If it is possible to check, the failure described sounds like a bad solder on a board. As stated, the connections are subject to a wide range of quality control. The good news is they are fairly easy to fix if they did not "pot" the boards in epoxy. It was probably a borderline connection that popped when you jolted it, so look toward a larger electronic component like a capacitor or the like with some 'mass'. Might be obvious when you open it up.