Yamaha DTXpress/DTXplorer/DTXtreme

I also own the great DTXTreme-2. I have my JBL set on stun, and my 
snare cuts out every second bar more or less. Cannot replicate the 
problem with headphones. No problems with toms or kick drum. 
Contacted Yamaha and they said to check patch cord, and pad. Since 
it works flawlessly through headphones, must be the module output to 
speaker, or JBL, or some weird thing between the pad speaker 
perhaps? Some suggest some type of pizeo feedback between speaker 
and amp. Anyone else having this type of problem. Sure places a damp 
towel on what is a module with awsome sounds and features. I have 
the reject and self reject settings as low as possable. Do not have 
cross triggering issues. 
Quote
"can tell that the signal and response of the kit starts to cut out. 
Any recommendations? Unfortunately, turning down the guitarists is 
not an option."  Thanks.