Ocassionally in Forza 4 all sound cuts out. The game continues to play but is totally silent once this has happened. If I exit to the dashboard sound is still gone and only a console restart gets it all working again. Its not all the time when playing Forza but it has happened to me a dozen or so times now. I'd suspect a hardware problem but it does only seem to happen in Forza. Any ideas ? Is this an issue anyone else has had?