Thanks for the responses, guys.

I thought about static, but it happens on my workbench, too. And, yes, it's the same antenna as before--good solid solder joint, and pretty good range check (only slightly less than before I cut the stock antenna and mounted the Deans). I know I don't have a signal problem from the transmitter 'cause the servos respond normally to control inputs, even when it's doing the glitch-dance.

I've got lots of wires crossing (not the antenna) among the servo and ESC leads--I didn't think twirling them any which way would matter...maybe it does.

I'll also try rerouting the antenna, but the odd thing is I had it next to my older batteries (insulated with velcro and foam) with no glitching problem. The yellow-wrap in the photo is medical wrap like you get to cover the site when you get blood--holds tight, and seems to insulate. Maybe it ain't doing so good!

Again, thanks for the ideas...

Graybug