I've got a TV with built in Freeview, separate DVD player. Now when I put it on there is no sound until I navigate to a different 'Input' via the on screen menu eg. TV for analogue TV or Scart1 for DVD, and then back to DVB for Freeview. Then the sound is fine, but it's annoying having to navigate away and then back every time - doesn't matter which option I choose to go to and then back, it produces sound when back on the Freeview option. Any ideas on how to fix, or why it does this?