Yamaha DTXpress/DTXplorer/DTXtreme

Hi all!
Did it ever happen to you that, when you hit the hi-hat pad while 
releasing the foot controller,AND, at the same time, you hit the 
snare or bass drum...you can't hear any sound coming from hi-hat??
I think it's a problem that came out just yesterday, when i tuned my 
Yamaha in every aspect, delay, self-rejection,dual layer, etc..I 
think I found good sounds for me..but this problem 
appeared..Oh,well, now the cymbal choke doesn't work anymore, and I 
don't know why..I could try to cancel my personal drumkit and redo 
from start!!
Bye,
Gianluca