So on the last trip I had my route programmed and decided to stop for a burger part way thru, I used the nav and added the waypoint. It updated the route on the HUD but never gave me any audio guidance for the exit. If I remember I think I ended up cancelling the route and setting the route again and all was good.

Until an hour later we pulled off again without telling the nav and from that point on the audio guidance continued but the route disappeared from the HUD (stayed on the centre console).

Any ideas?