I've had my wireless charger for 4 months now and never once experienced this. You put it down and it makes a slight vibration to tell you its charging. Sometimes if I've had a few beers I don't hear the noise and I have to pick it up and drop it down again.

This is still way easier than digging out the cable from between my bed and my nightstand and fiddling with it 'till it gets in exactly the right spot. Now I use my phone in bed and don't worry at all until I go to sleep and then it just works.