I went out last night all fine. jumped in to go home and after a few mins I'm thinking it's quite in hear.

no audio. can select all the inputs just fine and dab and radio stations show up fine but no sound.

tried on and off no such luck.

oddly if you press the little audio simble in the bottom right is I think it's to do with nav commands?

the audio comes through for a few secs then stops again.

any ideas

Yup possibly an issue during boot up sequence, leave it over night, I'd be surprised if it didn't work after that, but if not then maybe try the battery disconnect reset method, please read up on the complete method Current: 2011 FFRR Vogue SE 4.4 TDV8
Previous: -
2004 FFRR Vogue 4.4 V8 with LPG
1997 P38 4.0 SE with LPG
1997 P38 4.6 Vogue with LPG

Sounds like the issue i had a month or so back.

Only time i could hear music was each time the sat nav spoke, or when asking for a command from the voice system, lasted about 3 seconds then it went off again. Seemed to sort itself out over night. Not had it since. I think someone else had the same issue.