I am trying to control 4 servos with a joystick, but after a few seconds, they start spinning and don't stop until the power source is cut

Question

Here's my code. I don't know if the issue is the power source though. I only have access to my computer for a power source.

#include <Servo.h>
Servo servo1;
Servo servo2;
Servo servo3;
Servo servo4;
int joyX = A2;
int joyY = A5;
int Joyx = A2;
int Joyy = A5;
int servoVal;
void setup() 
{
  servo1.attach(A0);
  servo2.attach(A1);
  servo3.attach(A3);
  servo4.attach(A4);
}
void loop()
{
servoVal = analogRead(joyX);
  servoVal = map(servoVal, 0, 1023, 0, 180);
  servo1.write(servoVal);
  delay(15);
servoVal = analogRead(joyY);
  servoVal = map(servoVal, 0, 1023, 70, 180);
  servo2.write(servoVal);
  delay(15);
servoVal = analogRead(Joyx);
  servoVal = map(servoVal, 0, 1023, 0, 180);
  servo3.write(servoVal);
  delay(15);
servoVal = analogRead(Joyy);
  servoVal = map(servoVal, 0, 1023, 70, 180);
  servo4.write(servoVal);
  delay(15);

}