Lets not get confused here
A) All guitars have dead spots or you could say some notes are more alive than others.
The most common place is the G string (has the least energy to sustain) and between the 10th and 14th frets.
My Gibsons all do it and I can find notes that don't ring out on any instrument I play unless they are all equally dead.
PRS have it so do Acoustics and especially basses. PRS even sells a kit (different gear buttons and saddles to try and move it)
Seems like the longer scale lengths are worse than the shorter ones since they have more bass response and sustain in the first place so any lack of becomes more noticeable.
It is one of the oldest complaints in the world next to stratitus and fret buzz.
Usually a little finger vibrato cures it all.
Anything you can do to shift the resonance of the instrument can move it, like tightening the rod a little or loosening. Changing mass like saddles or tuning gears.
Making sure nothing is vibrating in the guitar like a pickup or loose screws. Try and loosen the neck bolts so the neck has slid all the way forward and then re tighten.
Trying to get rid of a dead spot is really not easy and usually we can only hope to move them out of your way.
The issue here.... wood, organic materials are unpredictable.
B) Not to be confused with a flip or a raised tongue where the wood has raised up creating a flip. This would responsible for abnormal buzz when the neck seems straight and can be easily fixed with a plek. It doesn't take much when you have low action to throw things out of whack and we can take care of that quickly.
c) Fret buzz is a relationship of all things that drive the string to vibrate. If you have a good setup you can look for issues like....
Is the nut low enough since if it is higher than needed you have a tendency to lower the bridge making buzz worse.
Pickups too high, especially the neck and middle pickups on the bass side.
Heavy touch or not being used to a longer scale length 25.5" (always more string rattle) as opposed to PRS or Gibson scale lengths
Single coil pickups pull on the strings much more than humbuckers causing excessive buzz especially when too high.
So guitars just like to rattle more than others. Many times it comes from the saddles or bridge. People who like low action and play hard, these dont mix.
Anyway.... please use email for support !