If you don't need advice on code, why post it?
If you post it why not do it properly?
The fact that you didn't post it properly distracted me from the rest of your message, wasting your time and mine.
It sounds like you are powering the servo from the Arduino and the Arduino can't provide enough current. Servos (and motors) should have a separate power supply (about 1 amp per servo) and a common ground with the Arduino.
...R