A4 whine at speed and remote locking

[pk001c@uhura.cc.rochester.edu]

Hello,
I had a few question I have a 97 A4 and when I am going at a contant 75- 80
mph there is a slight whine, however if I go above 85-90mph it goes away or
if I go below 75 anyone else notice this?

ALso sometimes when I lock my doors with the remote locking , the will not
unlock using the remote< i have to manually do it, i took the car to the
dealr and the couldnt diagnose it since it was an intermitent problem.
ANy ideas?
Thanks alot
97 A4
95 M3