This has been a very informative topic for me as well. My grandma is suffering from memory loss, although we can't find out what is wrong. She occasionally switches the television from the correct channel to an old antenna channel that is very fuzzy. It is the last one not to do the digital transition in my viewing area, and the picture is real bad, but she'll say that it is the only one that she gets.
I'm going to put her remote in limited mode now. I didn't know such a thing existed.
One thing that really helped was turning updates off. I don't like doing that, but if I don't, the satellite turns off nightly and returns to the Dish Network screen. At that point, she can't seem to remember that she needs to power it on every time she sees that screen, and then she would put it on an antenna channel that has bad reception.
I also was going to make a favorite list for her, but because she wants to retain her independence and live alone, I don't really know what stations she really likes. When I ask her, she'll just say whatever is on. Usually I leave the Game Show Network on whenever I leave her house, and it stays on that channel all the time. If I don't, then she just sits in her house with every light off, going through her mail over and over and over again.
I feel sorry for her, because her bill is outrageously high, but when I try to ask her what stations she would like to keep, she really doesn't know what station I am talking about. When I show her the station, she says she wants to keep it, but I never see her watching it unless I put it on.
I don't really know what to do, but I do appreciate the tip on limited mode. I'll do that the next time I go to see her.