THIS.
ANY guitar of any brand, electric or acoustic
might exhibit this symptom. Any.
Why? Because each and every guitar has a natural resonant frequency. Take 10 exact models of the same guitar and that natural resonant frequency of the "constructed guitar system" will vary. Different stresspoints, different densities, amounts of glue or pressure, inconsistencies of hardware or wood weight, etc. etc. etc. will cause the variance. So take 10 random exact models and 0 or 1 may exhibit a dead spot. And it could be at different "spots".
"Dead spot" really throws some people off. It's not the spot per se, it's the fundamental note played at the fret in question. If it matches the guitar's natural resonant frequency and is out of
phase with that resonant frequency, the guitar will steal energy (out of phase will cancel the note) and that note will decay faster than others. If it exactly matches the resonant frequency, and is completely out of phase, the effect is the most exaggerated. As some have noted, if it's exactly
in phase, you get a wolf note, not a dead spot. OK, carry on......
http://acoustics.org/pressroom/httpdocs/137th/fleischer.html