My setup: A Maestro 6 driving 6 Power HD-1800A servos. Servo power is coming from a 5v 2A wall-wart being run through a S18V20F5 5V voltage regulator. When I connect the power to the Maestro 6, several servos start moving independently and can't be moved through the Maestro Control Center. If I use a 6v battery pack, the Maestro and servos work just fine.
The voltage regulator is providing almost perfect 5v. Is the Maestro sensitive to being that close to the low end? Should I try a 6v or 9v regulator?
I'm stumped. Could it be a ground loop of some kind? Both the wall-wart and the computer driving the USB are plugged into the same house circuit.