Thank you so very much for your expedient help. I will look into all that you've suggested. And, yes, with as much technology that has been added by me, as well as by my neighbors likely, I expect that there could be several reasons why things aren't working like they used to. Cell phone chargers, wifi, printers. I'm just about certain that I was the only person here who knew about X10 when I first installed it many years ago and I wouldn't be surprised if I am still. Do you feel that some of the newer options like Insteon offer a better barrier to outside noise and interferences? Although I'm not willing to replace X10 just yet, I would still like to know. Don't worry about answering it, as I should be scouring the net about the differences myself. Also, I didn't think that a new HD243 would function any differently. I just worried that if the module went bad, I wouldn't be able to get anymore.