That's their way of fobbing you off without actually fixing the fault. They know that if the problem is tolerable, most people would rather put up with it than be without a stereo while they send it away to be sorted.
My last car but one had an interesting fault on the CD changer. At first, I thought it was certain discs, but I eventually tracked it down to being whatever was loaded in slot 2. All of the other discs played as you'd expect - carrying on where they left off if you stopped and restarted the engine. Disc 2, on the other hand, would always re-start from the beginning of track one.
I took it to the dealer, and got the same story. We can send it away for you, but sorry no replacement under warranty and no loaner. So I just put up with the problem.
I'd second the sentiment about the steering wheel controls. It's nice if you can have them working, but I'd hardly consider it a priority. The first thing I did with my 1995 Laguna was swap out the Blaupunkt for a Kenwood radio/cassette/10 disc changer that I already had. I lost the use of the steering wheel remote, but never missed it.
Currently in Horatio's garage:
2010 Laguna III Initiale.