Mine has no Nav, just the standard system. It went into VW colchester and they could not find anything wrong. The next morning it was frozen again. They said unless I could show it doing it, they can not help. I then sent them 5 videos off my iphone and email system showing it frozen, but they said they could not upload them, despite me sending it to my work computer and playing the video.
The latest is they asked me what solution I can suggest ! It then worked ok as warmer temperatures but in the last week, it has played up to not working at all on a 12 mile journey, some functions working and then it completely doing its own thing.
I am going to try them again this week by taking my iphone in to show them, as opposed to the usual home collection service, but it will mean taking time off work.
Anyone else had this over the cold spell??