Yamaha DTXpress/DTXplorer/DTXtreme

Hey all! Got my new DTXpressII and love it. Stayed up all nite last 
nite playing but have one major problem that is very annoying and 
that I cannot get corrected on my own. It is the VERY SAME problem 
that another group member (bohasi) had with his new kit. Bohasi - 
could you please tell me EXACTLY what you did to correct your problem 
of the hi-hat not triggering when you hit the snare and hi-hat at the 
same time??? Below is Bohasi's original post and EXACTLY describes 
the problem I am having. Walt or Bohasi or anyone that can provide 
some help in this matter - it would be greatly appreciated. Here is 
Bohasi's original post:

Bohasi said: When I'm hitting snare and hihat pad at the same time, 
they don't respond. It's either snare or hihat, not both, like they 
should. This can be even seen on lcd - one of the pad not responding 
when the other is playing. Every other combination (tom-snare, hihat-
tom, crash-tom...) works just fine. I've even changed the pads. The 
same problem (snare-hihat combination is problematic). But when I'm 
hitting snare and hihat pad very hard, then they both start to 
respond at the same time. What can be done? Is this maybe like a 
general issue with DTXpress or is it just on mine?