Re: DTT2500 Subwofer not working? Dry Joint?

My unit works fine except for occasional intermittent drop in audio about 50-70%, very annoying. The signal from computer doesn't drop but both satellites and woofer drop the same. Tapping board, signal input plug 1/8" not the cause. I hand soldered the complete board and problem still there, I use a different PS 3amp 12volt and tried different ones. It seems like it would be a cold solder joint but that's been ruled out, if it was the driver IC it would not occur on both satellite and woofer. Perhaps in the input preamp stage? Anyone...