I've worked it out ... the MyLink system's USB-stick media-player is bipolar.
We thought it was getting confused when we first got in the car because both sets of keys are stored fairly close to the car, so maybe it wasn't able to work-out which set was being used. But I don't think that's correct, because it won't let me open the tailgate unless I move one of those keys closer.
Plus I had occasion to do a bit of driving on Sunday, with a few stops along the way. It was definitely flopping between two "last played" memories. It was set to play all songs on shuffle, the song-names in the following may or may not have been changed to protect the innocent &/or my memory of the exact tracks involved:
(*) the first time I turned the car off it was in the middle of Alice Cooper's
Trash, then when it started-up it was playing something totally different
(*) the next time I turned the car off it was playing Fleetwood Mac's
Gypsy, when I started it up it started into Alice Cooper's
Trash
(*) the next time I turned the car off it was playing Pink Floyd's
Comfortably Numb, when I started it up it picked-up Fleetwood Mac's
Gypsy
(*) the next time I turned the car off it was playing Guns 'n' Roses'
Mr Brownstone, when I started it up it was in the middle of Pink Floyd's
Comfortably Numb
... and so-on.
Each time I'd turn it on, it would go back to what it was playing when I'd turned it off
two times ago.
If I wasn't afraid to go to a dealer I'd take it back & ask them if this could be fixed, but it's not annoying enough (but then nowhere near as annoying as "indexing" blocking you from making any changes for 5-10 minutes every time you turn the car on, so you have to fiddle with it while you're driving - I presume something to do with old hardware so they probably can't fix this with a software change).
try_again said:
Does sound come out of the speakers..? Well then you have an amp! Even if it's not a 'premium' system it still puts a drain on the battery.
By the sound of it, it's an internal amp in the head-unit, and it's quite a small one ...