Infotainment System Cuts in and Out

We have a new shape 2003 Vector with an infotainment system which has SatNav. It's been great until today when it's started to cut out. It did
this one before several months ago, but seemed to right itself, so I forgot to ask the garage to take a look at it. Does this issue ring any bells with anyone and if so, what did you do to fix it?
Add pictures here
<% if( /^image/.test(type) ){ %>
<% } %>
Add image file
Upload is a website by car enthusiasts for car enthusiasts. It is not affiliated with any of the car or spare part manufacturers or car dealers discussed here. All logos and trade names are the property of their respective owners.