We have been using a Panasonic 2.4 GHz Digital Gigarange device for\nseveral years, it's always worked well. Recently people have started to\ncomplain that the sound at the other end is breaking up. The batteries\nare fresh. Any ideas about what might be the cause? Naively I tend to\nthink of this sort of electronics lasting forever, but maybe something\nages. Capacitors?