This problem started a year ago but in the beginning only less than a minute and only when the weather temp. was low (close to or below 0 deg. cel.). Now is has become much worse and the instruments on/off can continue after start for 10-15 minutes even in quite warm weather. If the car is very heathed by the sun I never have this problem.
dashboard on/off blinking for several minutes after start - cold weather bad on 2000 Audi TT Quattro
by eli.schroeder in Eureka, CA on August 17, 2011
ANSWER by dandd on August 18, 2011
Sounds like the Instrument Panel circuit board may be wearing out. I have replaced several in Audi vehicles so it is not uncommon.