Logic Faders Raise, faders like to move up Options

[bigsal]

hi. i've been having this problem for a while now and finally decided to post this question to see if someone can answer it. Well here goes. In logic mixer view i have my faders in 2 rows , top and bottom (since i have 100 audio tracks) everything is cool and fine but from time to time i notice my faders from the bottom like to move upward.. the whole row! and then sometimes it overlaps them just a little. Why does it do that? to get to mixer view i use the screen lock feature with my num lock keys. Any suggestions?

thx