I am sure that I AM doing this. we are talking about DTV Channels, not analog NTSC. My machine displays a screen when you do this that says all stored channels will be overwritten, do you want to proceed. and then, it wipes the memory and re-memorizes. I called sony and they did verify this. there is nothing wrong with my box, it is not defective. I thank you for your help, but what i want to find out, without spending another 45 minutes on the phone, is if sony has a new firmware update.