After reading the existing threads on Random Reboots, and considering the evidence of my own experience, I've decided that what I appear to be witnessing are power-downs/ups instead. Well, at least that's what it appears like. If a reboot does just that, and the hummy comes back up in a powered on state e.g. showing a picture, then this is different: it comes up as far as the Hummy splash screen, and then most definately exits to powered-down-idle mode (not Blue). This has only started recently, but it is occuring more frequently. Probably just coincidence too, but at one point I thought it might be some power-down timer, as it has happened a couple of times at roughly the same time of night. It might however just possibly be viewing habits, though. I do know that it will power-down automatically if left 'alone' for a number (3?) hours (without 'touching' the controls). I don't think that's it, if only because a) we invariably pause or skip adverts during playback well within that time and b) it has happened even when the box was recording in idle mode (because recordings are reported as such and truncated). To cover the obvious - no there have been no real power dips or the like, and it is fed via a filtered and surge-protected psu distribution. So, before I try resetting the box back to factory defaults as some people have been advised by Humax when their boxes becuase unpredictably unstable, I thought I'd throw it open to everyone for their thoughts.