smg problem ?

[m3dan]

i have noticed that sometimes the gear indicator on my e46 m3 smg flashes.it doesnt do it all of the time and i am wondering if this is a fault or is this normal.i have looked in the manual but it doesnt say anthing . it flashes whether it is in S or in A. i have only had the car a fortnight, and each time it has done it it has been freezing cold outside, is this just warning me about the ice or is it the start of an expensive smg ownership.
any advice welcome.