You may need to add decoupling capacitors. Try some 0.1uf ceramic capacitors across the servo power rail. If you have long wires connected the servos put capacitors at both the servos and power supply ends.
You may need to add decoupling capacitors. Try some 0.1uf ceramic capacitors across the servo power rail. If you have long wires connected the servos put capacitors at both the servos and power supply ends.