MBUX on 2019 mercedes winchcombe

Hi 
I have just had a problem with my MBUX  screen in my  2019 winchcombe, the screen was black and the radio still playing and the bluetooth would not disconnect.
 After trying to find out what was wrong because nothing would turn on or off (buttons or touch screen)I found the answer on youtube.
Sorted by a soft reboot by holding the "TEL" button on panel with the "star" button on the steering wheel (with engine on) at the same time and the screen returned with everything working as normal.
  Hope this may be useful if it happens to other mercedes owners.

Great tip, how did we manage before youtube.