Sikulix subprocess module overflow error

Hello,
We are writing tests for a large project using Sikulix. It helped us test many scenarios. But some of our tests are too long. At some point in these long tests, I think we're reaching the limits of the JVM and the test freezes. When we terminate the sikulix.jar process, the test continues from where it left off. At this point, I ask for your help. (I use thousands of images and static functions). I cannot detect the error.

I am using the subprocess module. And as far as I have determined, it freezes after running this function 218 times on a computer with 8 GB of RAM, 1180 times on a computer with 64 GB of RAM. I tried different operating systems (ubuntu, centos) same problem.
The communicate() function in the Subprocess module causes an overflow even though I terminate the process.

I am waiting for your help.

# -*- coding: utf-8 -*-
import subprocess

class window:
    @staticmethod
    def check():
          i = 0
          while True:
              print("i >>" +str(i))
              print("Start SUBPROCESS 1>>> ")
              p = subprocess.Popen("exec xdotool search 'window_name'", shell=True, stdout=subprocess.PIPE)
              print("END SUBPROCESS 1>>> ")
              print("start communicate 1>>> ")
              result = p.communicate()
              print("end communicate 1>>> ")
              p.terminate()
              print("end terminate 1>>> ")
              id = result[0]
              print("Start SUBPROCESS 2>>> ")
              p = subprocess.Popen("exec xdotool getwindowname 'wındow_pid'", shell=True, stdout=subprocess.PIPE)
              print("END SUBPROCESS 2>>> ")
              print("start communicate 2>>> ")
              result = p.communicate()
              print("end communicate 2>>> ")
              p.terminate()
              print("end terminate 2>>> ")
              x = result[0]
              i += 1

window.check()