Disco 4 Radio,sat nav problems

Hi all. I have searched the forum at length but haven't found any links to this issue. Hopefully someone can offer some advice.
We have recently bought our fourth Disco 4. It's a XS on a 2012 plate. The sat nav and radio system is really, really, slow. If you are listening to the radio and you want to switch the sat nav on it takes over 5 seconds whilst it thinks about doing what you asked!!,
Has anyone experienced this problem? Is there a simple fix for it please?

Welcome to the forum.
Disco 4 is a bit new for peeps on ere but there are some. Similar to the disco 3 and rr technology so have a look around the sections relating to those vehicles. I often use google to search on ere as it's easier "www.landyzone.co.uk freelander gearbox..."

Thanks for the tip.
Will take a look as you suggest