PyFirmata stops responding after some time

Projects Interfacing w/ Software on the Computer
1

I made a python program with pyfirmata that controls servos and/or brushless motors. It works great for a couple of seconds, but then stops responding. I made a short test program as well, and the same thing happens there too. Is there some setting that I dont know of or what is the problem?

Here is the code for the test program:

import pyfirmata
import time
PWM_pin = 9

board = pyfirmata.Arduino('COM3')

board.digital[PWM_pin].mode = pyfirmata.SERVO


def rotate(pin, angle):
    board.digital[pin].write(angle)
    time.sleep(0.015)


while True:
    angle1 = input('What angle?')
    rotate(PWM_pin, angle1)
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