I am using a memory stick in usb port. It was fine until today when it wont let me skip forwards or backwards using steering wheel or radio controls. Controls on steering wheel and radio are fine in other modes. Any ideas?

Do u mean it keeps playing same track and wont change? If so press windows/voice button and say 'loop off'

tracks wil play in random order but cant skip forwards or backwards,

problem solved. Contacted local dealer and took the car round today. Twenty minutes later its ok. Apparently the system had "locked" and they had to unlock the thing. Pleased with dealer for sorting it out quickly. I just hope that it doesnt happen again.