Yamaha DTXpress/DTXplorer/DTXtreme

I play my dt along with a cd player going through my p.a. system. 
lately I've noticed my cd's are skipping. I've taken the player in for 
repairs 3 times.  I've narrowed the problem down to my f tom trigger. 
I've changed the wire and the pad but I get the same result. I have 
even changed the tuning . any suggestions would be appreciated..

                     thanx, melon