Multi Function Sterring Wheel / MMI Fault on cold days

[gilesms]

I have an unusual fault on my 2006 Audi A6, on a cold morning around 2 degrees C and below the when you start the car the Multi Function steering wheel controls are non functional. As well as that the time on the MMI centre screen freezes displaying the time the car was started but the time on dash continues to work, the Parking sensor display doesn't come up on the MMI screen nor does the Heating controls. If I reboot the MMI (pressing setup, MMI centre button and setup) then it all starts working again. It only happens when it is cold.

I have MMI High, Colour DIS, Advanced parking and satnav etc.

I have had this fault each winter for the last couple of years and I am taking it into the Dealers soon to try to get it fixed, just incase they scratch their heads (like they did last year), I thought I would ask on here if anyone has seen this or knows the Audi tech well enough to suggest what component might be at fault.

Any suggestions gratefully received.