hello I Connected a servo motor to my Raspberry pi Zero W

and used the example from raspberrypi.org: granpa scarer:

Grandpa Scarer

and the servo worked however after changing the value for: p.ChangeDutyCycle(3) to an other value the servo stopped working it makes a sound like it trying to move but can't.

I changed it back to it's original value but the problem remains I switched to an other servo that I had and that one worked, so I switched back to the first one (a smaller one) and now it worked.

But after playing around with it for a couple of times, the issue came back

Has anybody else experience this?