#1
PRS 3 way push pull. when i switch the neck quickly, whether in single or HB mode, my neck pickups cuts out once in a while. i can always manage to get it back though. this switch got put in 14 months ago, i believe its a switchcraft.. joint coming loose maybe? i wiggle wires but i havent found anything yet
cheers
PRS CE22
PRS SE Santana
Fender Spalted Maple Tele
Squier Affinity Tele w.mods
Mesa Boogie Mark IV Combo + 212 Recto Cab
Homemade Ash Bass
BBE Two Timer
DUNLOP Wah
BOSS GE-7
KORG Pitchblack
MXR Dyna Comp

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#2
well its a wire somewhere, or the pot itself has an issue.
wiggle the wires more, no connections look loose? make sure you find which wires come from the humbucker, and follow them, shaking each connection. wiggle the pot, wiggle the knob, see if you can replicate it. thats the best you can really do.