Brightly lit, multi-light object flying in erratic pattern near seashore at Oak Island, NC

While sitting on the seashore-facing deck of the beach house where I was vacationing, I saw a group of lights that all appeared to be attached to the same craft, though the craft itself wasn't visible, flying in a very erratic, "humming bird" kind of pattern.  There were two red lights that were constantly on, in addition to a pulsating white light that appeared to be almost like a landing or search light, accompanied by a series of blue, violet and green lights that pulsed intermittently. 
It was completely silent, very bright and would hover at times while following a very erratic, non-linear flight path. It zigged and zagged and eventually flew off after a few minutes.  I thought it may have been a drone, but it was absolutely silent and, while it was hard to estimate the size, probably too large to be a drone.  At least not like the size of the drones that I've seen for sale to the general public. 
I'm curious to know if other people witnessed what I saw.  I'm a photographer; the other witnesses were a salesman, nurse and doctor of psychology.