Hello all. First time post so be gentle! I have recently purchased a 2004 3.0i Sport for my better half and there appears to be an issue with the sound system. Sound sometimes comes out of all speakers when the car is started, but then quickly changes to only come out of one speaker. The car is fitted with the in-built Sat Nav. I have tried to search all previous posts to see if there is any type of history to this problem but cannot find one. I have checked the balance/fade settings. Any help would be appreciated!