Hi

Looking for some advice on sound loss in 2011 LCI e70 - UK spec.

Had car from new and covered 100K miles (fyi on topical chats> no gearbox oil change and all OK).

Car is fairly high spec (Vin is L793067)
On sound there is:
6FL USB-/AUDIO INTERFACE
6NF EXT.CON.OF THE MUSIC PLAY.I.MOBILPH
6NR APPS
6VC CONTROL COMBOX
601 TV FUNCTION
609 NAVIGATION SYSTEM PROFESSIONAL
633 PREP.MOB. PH. BUSINESS BLUET.INTERF.
654 DAB TUNER
677 HIFI SYSTEM PROFESSIONAL
694 PREPARATION FOR CD CHANGER

So issue is with complete sound loss.

History:
about 18 months ago I had complete sound loss from system. Checked fuses all ok and ended up putting into BMW technician friend who could find no fault (suspected amp). He re-coded / flashed module (assuming re-flash of factory setting to amp) and sound returned.

Recent:
Was listening to song fairly loudly and switch car off whilst turning sound down and lost sound again.
During the past couple years another gremlin I have found is that if I took a corner sharply (- the kind that causes stuff on the passenger seat to slide off) the sound would go off, but if you turned up volume button sound level returned and increased as normal. I assumed this to be linked to some emergency function that shuts down certain items in car in event of crash etc.

Have checked fuses again and all ok. I have disconnected MOST plug located under passenger footwell and left overnight to see if that forced a MOST reset (no joy). I have ordered up a MOST loop plug to see if I can isolate bit of kit that is causing issue. Though I've never stripped back of car and not sure where all kit will be (car is seven seater).

I could give it to mate who is BMW tech and he can suss issue (or do a re-lash) but nowts free and cost will be iro $80 bucks and if car is going to suffer reoccurring gremlin I would rather try and isolate, learn on my own how to get working again.

Any one have any guidance, ideas.

Car runs really well and I want to keep for another few years so need to solve as nae sound is rather, well, quiet...

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