Qi Charger pad and receiver for my Samsung S3 worked fine to start with but now do not charge the phone. Placing the receiver alone on the pad causes the indicator light on the pad to go from green to blue; and output on the receiver (5V) shows that these are working. Same behavior observed (no charging) with original and a replacement battery; so is there a software switch (Android 4.3) that I have inadvertently turned off? Or, is it that I just happen to have two faulty batteries - note that both charge (and hold it) via the USB port.