The same has happened to me. I have been posting furiously on the "community freesat" website. All recordings lost (from Xmas!!). Box has been near frozen for 2 days now. Its taken 2 days for it to tell me why it has deleted all my recordings - tells me I have to reformat the hard drive. But now its decided that I set up a pin on the box (I didnt) and I cannot reformat until I type in the pin. OF course I have no pin.
It all started 3 or 4 days ago. The box has been totally frozen (not just the remote, the box controls too) for days at a time during that period. Only last night did it sufficiently unfreeze to tell me why it has deleted all the recordings.
What disappoints me most is that there is clearly a major problem going on with alot of boxes, and Humax does not appear to have made any announcement to anyone. This level of support is unacceptable. I think I am returning the box at the weekend and moving across to Echostar.
I have the 1tb version, bought a couple of days before xmas, with the v16 software.