12 Servo's together does not seem to work, Power problem

[emavil]

Even if you use a stronger power supply, you may get the same problem along with some other problems.

Even though all V+ and GNDs will be parallel for all servos, the last ones in the power line will still be getting low voltage.

I suggest you make a connection as below.

In Figure1, S1 does not get the same voltage as S4 or S5.
In Figure2, all servos get the same voltage.
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I am curious about the schematic diagram in figure 2, can u give possible PCB layout for those servos. including power supply, location & connection and a simple microcontroller like PIC16F84A? Do i have to design the pcb following the arrangement of servo connectors found in Figure 2?

I stopped the servo motor programming 'coz i also encountered the same problem. I have only 2 servos, one for steering and the other for acceleration. Both of them mounted perpendicular to each other. As I turn on the circuit, instead of performing the desired action which is move forward, the steering servo tends to turn left, sometimes, right. I still have to do some series of power on, then off, then on, then off until it behaves according to what is expected.