I'm not sure you can use anyone else's experiences of recording whilst they have been away as a yardstick, as surely it depends what programmes you set to record as opposed to another persons recording schedule.
As Graham remarked the tennis and football has caused issues so if your schedule clashed with those events then you have your reason. I too have had a couple of missed recordings. However, when I did a bit of digging it turns out the programmes had not been broadcast due to tennis.
God how I hate the BBC and its tennis coverage. Why can't they put all the sport on another mux for a few weeks and give us all a break.