If the faders are sticking then the heat your probably feeling is from the constant pull on the motors. I won't say I had the same problem but this was the cause of mine.
Thanks for the reply Casey, The faders seem to be locking up and feel stiff. A little movement seems to release them but then the next time I switch banks they lock up again and start to warm up. Not sure of a solution...........
Is it all 8 faders in the bank? I would try Casey's suggestion but instead of physically moving the fader banks, I would just swap the fader bank side of the ribbon cables between the two banks to see if the behavior is the fader bank or it is further upstream.