Radio Problems

[northpolar]

I wonder if anyone can point me in the right direction. I have a 2013 f11 535d and yesterday I noticed that the dab radio only showed two stations instead of the seemingly unlimited number which is normally available to scroll through. This morning the two stations is reduced to only one. Any ideas why this has happened or if there is a reset protocol to avoid having to book it in. It's still under warranty but hoping there is a quick fix for this. Thanks.

Peter