Ok now I'm using a 5v regulator to supply power to the servos. It works flawlessly with the sketch that includes serial debugging code. But the littering begins as soon as I remove the serial code from the sketch.
To answer your question, I'm trying to make a basic control board for a tricopter. I know i will need more then 3 chanels (at least 4 + gyroscopes) but this is to test how many chanels I can read reliably.