Computer freezes while collecting serial data from Arduino Uno

I am an arduino noob. I have been searching for some interesting arduino projects recently and making a game controller using Arduino UNO seemed interesting. So I hooked up two dual-axis joystick modules to the arduino board and wrote a program to print something corresponding to the joystic movements. I collected the serial data through USB and passed it on to a python program. The code works fine, mostly. But the problem is, when I hook up the circuit and start using the joysticks, after few minutes my system is freezing.

Why is my system freezing?

What can I do to avoid the freezing?

My system info:

1.Windows 10 64-bit

2.4GB RAM and 512GB HDD

Here is the code

int SW = 9;    // mouse joystick 
int xpin = A0;
int ypin = A1;
int SW1 = 6;  //movement joystick
int xpin1 = A2;
int ypin1 = A3;
void setup() 
{
  Serial.begin(9600);
  pinMode(SW, INPUT);    
  digitalWrite(SW, HIGH);
  pinMode(SW1, INPUT);
  digitalWrite(SW1,HIGH);

}
int prev_state = 0; // previous state of switch
void loop() {
  int z = 0, xpos = 0, ypos = 0;
  int z1 = 0;char xpos1='0', ypos1='0';
  int x = analogRead(xpin);
  int x1 = analogRead(xpin1);
  int y = analogRead(ypin);
  int y1 = analogRead(ypin1);
  int sensitivity = 15; //mouse sensitivity
  
  if (x >= 550)                  // when moved up
    xpos = map(x, 550, 1023, 0, sensitivity);
  if (x <= 450)                // when moved down
    xpos = map(x, 450, 0, 0, -sensitivity);
  if (y >= 550)                 // when moved right
    ypos = map(y, 550, 1023, 0, sensitivity);
  if (y <= 450)               // when moved left
    ypos = map(y, 450, 0, 0, -sensitivity);
  int curr_state = digitalRead(SW);
  if (curr_state == 1 && prev_state == 0) // when SW is pressed
    z = 1;
  else
    z = 0;
  int prev_state1 = 0;
  if (x1 >= 550)                  // when pressed d
    xpos1 ='d';
  if (x1 <= 450)                // when pressed a
    xpos1 ='a';
  if (y1 >= 550)                 // when pressed w
    ypos1 ='w';
  if (y1 <= 450)               // when pressed s
    ypos1 ='s';
  int curr_state1 = digitalRead(SW1);
  if (curr_state1 == 1 && prev_state1 == 0) // when SW1 is pressed
    z1 = 1;
  else
    z1 = 0;
  if (xpos != 0 or ypos != 0 or z == 1 or xpos1=='d' or xpos1=='a' or ypos1=='w' or ypos1=='s' or z1 == 1) // prints when the joysticks are moved
  {
    Serial.print(xpos);
    Serial.print(":");
    Serial.print(ypos);
    Serial.print(":");
    Serial.print(z);
    Serial.print(":");
    Serial.print(xpos1);    // prints the data and separating by ":"
    Serial.print(":");
    Serial.print(ypos1);
    Serial.print(":");
    Serial.println(z1);
  }
    
  prev_state = curr_state;
  prev_state1 = curr_state1;
   delay(10);        
}

I am using a python program, in visual studio code, to read the arduino serial data and perform the required operation.

The python code

import mouse, sys
import time 
import serial
import keyboard as kb

mouse.FAILSAFE=False
ArduinoSerial=serial.Serial('com3',9600)  #assigning com port
time.sleep(1)  

while 1:
      data=str(ArduinoSerial.readline().decode('ascii'))   #read the data
      (x,y,z,x1,y1,z1)=data.split(":")           # assigns to x,y,z,x1,y1,z1
      (X,Y)=mouse.get_position()        #read the current position of mouse cursor
      (x,y)=(int(x),int(y))                           
      mouse.move(X+x,Y-y)           # move camera/mouse
      # press the desired keys corresponding to joystick movement
      if y1=='w':                   
         kb.press('w')
         kb.release('w')
      if y1=='s':
         kb.press('s')
         kb.release('s')
      if x1=='a':
         kb.press('a')
         kb.release('a')
      if x1=='d':
         kb.press('d')
         kb.release('d')
      if '1' in z:                        # read the Status of SW
         mouse.click(button="left")    # clicks left button
      if '1' in z1:                    #read SW1
         kb.press('space')             # press space