Reply to s4 fader A moves on its own

hey guys and gals...

Ive had my s4 for aprox 8 months. Only now am i getting this problem, its so annoying!

push fader A up to top it moves back down (10-25%) (on its own!!)
while fader A is up... if i move fader B up it moves down same percentage!

ive noticed that there are a few with same or similar issues and NO one has given a fix.

can some one please help????

I have re-installed and recaliberated and cleaned faders so thats not the answer!

I do not wish to switch to channel C and D as i use all 4 of my decks.

If i need to send my s4 to NI then so be it, but id really like to no y this is happening, so i can help others having similar issues!

many thanks and i hope someone has an answer to this wierd issue

SKAR