If you press the bind button while powering up, the transmitter will go into bind mode, which it must then be bound to the receiver before it will function on that model. The range would be low if the bind button were stuck, as holding the bind button reduces power output for range checking. No, standing near a large metal object may simply cause the system to not link. As I mentioned, it is not possible for the system to 'lose bind'. Linking and binding are 2 different things. If the switch or battery does not provide adequate power to the receiver that could cause problems functioning.