I have a season pass for Match of the Day. I've just noticed that it didn't record last Saturday (May 13th), and I can't work out why because there was nothing else recording at the time. I've checked the activity and recmon logs but I don't see any mention of it. My wife says that it also failed to record at least one of her recordings on the following evening (May 14th). Any idea how I can diagnose these issues?