Sorry for the delay. You won't necessarily know anything by doing this. But you may, and it's worth doing IMO. Best way to do is remove all cables from the back, and holding in one hand "exercise" the switch fairly rapidly. Is it clicking into place solidly in both directions? Then you probably haven't learned anything. Seems to me the problem is very likely one of 3 things: mechanical fault, electrical (contact surface) fault, or perhaps you have been too gentle when manipulating the switch.