My primary guitars are Fender Stratocasters and they're pretty well known for having little things come loose with all the screws and hardware attatchments to pickguards.... So, what I usually do for the input jack problem - take some super glue and put a drop on the nut or the shaft of the jack and screw it down. This holds the nut in place. For the switch, it may be the same problem. There could be a washer or something loose underneath the switch... I'd say unscrew the switch and pull it tight, then tighten it down again. If that fixed the problem, maybe dab a drop of superglue on there to hold it tight

Be careful with the super glue though... it's not friendly to guitar finishes.