Well I got my old issue resolved (non booting NextBox) with a replacement NextBox 3. (I was finally cleared to start driving again).
Now however I'm seeing a new, frustrating issue. I schedule a recording (single program; browse guide; select record). I see the red light appear on the front panel to show a recording is happening. I hit the list (green button) see the program with an indication that it is recording. At the end of the program I see the red light turn off.
I return to the list of recorded / scheduled programs, and the new recording has disappeared!
The issue is likely a poor signal at your home or neighbourhood. Changing out the box probably did nothing. What's happening with your recording disappearing is that the signal is poor and the programme is not being recorded in the first place.
It's almost always the signal and only very rarely the box as I indicated earlier - link again below: