Distance and objects (like metal) can easily interfere with the signal, as well as any switching of the wires at any point, or any of them being slightly out of their port.
I'd recommend using the contact numbers and sites available to you in your booklet. I can't send you mine... we might have different models, and I'm pretty sure they will ask you for a series of contact numbers upon e-mailing/calling/throwing brick through window-ing them.
