Thanks, y'all.
The sound guy had me take my cell out of my pocket and put it away. I also have a iPad (with data signal running and checking email while we play) mounted on my mic stand, but it didn't seem to make a difference. I put the guitar down and played other instruments for about 20 minutes, instead. When I picked it back up at the end of the night, the weird noise was completely gone.
Considering this didn't happen at any of the other gigs with this exact same rig, I'm going to assume that this was some isolated weirdness.
Thanks!
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