I too have raised this issue with Lexus Birmingham, and I have received a letter from Lexus GB mentioning that they will pass my feedback on this issue back to 'Lexus' (not sure where!). I find the issue very annoying; having spent 2.5k (or whatever it was) on the ML system, you'd wouldn't expect to have this issue. Apart from this, great car! I'll let you know if I hear anymore...