My guitar started giving me some serious whine recently (never before). It seems to mostly happen when I play the 'D' chord. I have contacted Schecter, and they seem to think, after watching my video (above), that it is NOT the PUs, but that the sound is resonating. This is very frustrating to me, and I would like any advice to fix it. I can't use any of my overdrive/distortion pedals anymore, and my onboard amp distortion isn't any better. I can have my Gain nearly at zero and it still whines. This doesn't happen at all on clean.
Things I have already tried:
switch cables
change strings
lowered PUs
changed PU battery
tried multiple amps