Have you tried putting into stand-by, and then after the disc inside appears to be making no noise at al lswitching the power to the box totally off, and after 10 minutes turning it back on again?
When you state that it has stopped playing back recordings, what precisely is happening?
Which box do you have? The FVP-5000T is a Freeview box and not a Youview box. On its menus does it state Youview or Freeview?