I just purchased a Toshiba DVD recorder/VCR combination which is hooked up to a digital cable box, primarily so that I can time shift programs. Whenever the unit is in DVD mode and I switch channels on the cable box, there is an annoying, rapid clicking noise that occurs during the couple of seconds it takes for the channel to change. Also, during cable reception the clicking noise can be heard intermittently, but at a lower level and causes the audio to sound slightly distorted. This noise does not occur when the unit is in VCR mode. The new unit is replacing another DVD recorder, with which I never had this noise problem. Does anybody have an ideas about what might be causing this noise ?