Arduino Nano PWM interferes SERVO

Question

I tried to make soap - bubble robot for my kid. It is simple. There is lever on servo that soak the ring in soapwater and place in front of fan. Problem is that when I activate PWM servo begin to misbehave (shaking, tremble go to 0 position) although they don't run at the same time. Seems that there is some noise in servo pin during PWM.

  #include <Servo.h>
  Servo myservo;  // create servo object to control a servo
  #define MOTOR_PIN 11 
  int pos = 0;    // variable to store the servo position

  void setup() {
    myservo.attach(4);
    pinMode(LED_BUILTIN, OUTPUT);
    pinMode(MOTOR_PIN, OUTPUT);

  }

  void loop() {
    analogWrite(MOTOR_PIN,0);
    delay(100);
    for (pos = 30; pos <= 120; pos += 1) { 
      // in steps of 1 degree
      myservo.write(pos);              
      delay(10);                      
    }

     for (pos = 120; pos >= 30; pos -= 1) { 
      myservo.write(pos);              
      delay(10);                      
    } 

      digitalWrite(LED_BUILTIN, HIGH);   
      delay(200);                       
      digitalWrite(LED_BUILTIN, LOW);    
      delay(150);                       
      digitalWrite(LED_BUILTIN, HIGH);   
      delay(150); 

      analogWrite(MOTOR_PIN, 400);

      digitalWrite(LED_BUILTIN, LOW);    
      delay(150);      
      digitalWrite(LED_BUILTIN, HIGH);  
      delay(150);                       
      digitalWrite(LED_BUILTIN, LOW);  
      delay(150);      
      delay (3000);

  }

Image of protoboard servo and pwm