6 Servomotors on Arduino board (problem)

Hi, i have connected 6 servomotor on Arduino Uno without external power source.

Problems start when is everything connected and some servomotors without commands starts blinking or laggind and led control on arduino blink.

Scheme:

Where is problem ?
i need external source or what ?

Thx (sry for my english)

i have connected 6 servomotor on Arduino Uno without external power source

Don't do that.
Use and external power supply for the servos.
Don't forget to join the grounds.

You absolutely have no hope of running 6 servos (servo, not servomotor) off Arduino 5V.

You don't have a hope with one, and you shouldn't do it at all as it risks frying the board.

You need a decent supply/LiPo pack(*) capable of 5A or more for the servos, just common the grounds.

Motor supplies and logic supplies don't mix.

(*) except most servos don't like 7.4V, so perhaps SLA 6V battery