I've had my Tivo box for a few years now. Recently it has started recording on it's own, that is I haven 't set it up to record. When I see the red light light come on I go into programmes find the culprit and stop recording. However if I don't notice the light I find it hasn't recorded anything anyway. Really weird.
Is it recording suggestions for you? At the bottom of the list on my shows is suggestions. Check there. You can turn suggestions off if you don't want them. If it's not suggestions have you set up a wish list you've forgotten about?
Yes! That suggestions for you. It supposedly learned what you like to watch then records similar. I turned them off after it only ever recorded midsummer murders (never seen an episode!) and the news! Very odd.