i have the same problem with my coupe
there are a few ways of sorting it out
get BMW to re-align the windows takes them an 1hr
re-new the door seals because the coupe door seals wear quickly
or do what i do,,once a week i vasaline them or a similiar rubber lubricant
i have used the bmw lube i have used washing up liquid
i have used vasaline
and ive used holts rubber spray
all work to a point
the dealer option is good for 6 mnths
the other options last a week
the new seal option sounds good but there is a sensor in the seal to tell when the window is up~(i think)
so i didnt try that
if any1 knows how easy it is to change the door seal,,let us know
