i have a varix 700 ad after about 2 yeras of use i noticed a sound drop off when playing the low E, i thought it was a piezo problem and i changed it.

Now after 2 month with the new piezo sometimes the low E sound drop off again. The piezo is new, is it possible that the problem is somewhere else? or maybe is an electric problem that brake everytime the piezo on the low E?

please help... or i will burn a variax..

thanks