Inside every Snapper is a tiny computer, and a very fine copper wire which wraps round the whole device and works as an aerial (you can see them in the diagram here showing the inside of a Snapper).
If this aerial is damaged or broken, then your Snapper will stop working. This is why it's best not to drill holes in your Snapper, bend it out of shape, cut it, saw it in half, let the dog chew it, chew it yourself, put it in the tumble dryer.... You get the picture.
If you really want to hang your Snapper, check out Snapper for your keyring and the Snapper accessories for some handy solutions - all of which are available from the Snapper store.