I've had similar random results with Gadget Show and other Five programmes. Some record, some don't. I also have seen on two occasions an instant lock-up when recording the Gadget Show and trying to switch the box on during the recording to watch something else. I get a v.brief flash of the current channel on the screen, then no response, no picture nothing until hard powered off and on again. This is about the only way I've ever seen a lockup but haven't yet had time (or inclination) to experiment and see how repeatable this is. Not sure it would be helpful anyway as I'm unsure whether this information would have any bearing on the Humax bunch that are suggested to be pondering whether to perhaps think about creating an update to fix such issues... ahem.