Since having the software update my Home Screen crashes almost every ignition start... but then going into the main menu and selecting nav... then going back to the home screen seems to cure the problem.
This has been fine to live with until Lexus get another fix... but last week I was getting a really strange one. I was about to get on the motorway (M54) at Telford and the sat nave said please take the 18th exit at the roundabout.... there was 6 or so exits on the junction and it wanted me to go around the roundabout three times... Like a fool I did it partly to see what would happen and if it was counting the junctions. I have not been back since so cannot tell if this is a software problem or a mapping problem in general!