Hi Raiman,
    I hope this helps, this is the basic flow. The vncStart never comes out if 
the unit exists but connect fails. Now I have seen the same type of behavior in 
KRDC (linux RDP/VNC client)

for n in rang(200):
    wait("reboot.png", 6).click()
    sleep(2)
    # function in our code, hence 2 sleeps
    sleep(5)
    vncStop()
    sleep(70) # reboot with 20 sec grace; sometimes reboot takes longer
    vncStart(ip=unit['ip'], port=5900, password=unit['passwd'], 
connectionTimeout=10, timeout=120000)
    sleep(2)

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https://bugs.launchpad.net/bugs/1885858

Title:
  Unable to connect VNC from sikuli after 39th iterations

Status in Sikuli:
  New

Bug description:
  Python version 3.7.4 64 bit
  Sikuli 2.0.4 
  Windows server 2016 DC 64 bit & windows 10 64bit

  Procedure:
  1. installed python version 3.7.4 with sikuli 2.0.4 (windows server 2016 DC 
64 bit & windows 10 64bit)
  2. using Git clone cloned the source to local machine
  3. created the reboot script in python 
  4. Accessing device using VNC viewer 6.19.107 using sikuli and python
  5. performing reboot operation in loop 
  6. used below code to connect the VNC 
  def connect(unit):
      if unit['connection'] == 'vnc':
          vnc = vncStart(ip=unit['ip'], port=5900, password=unit['passwd'], 
connectionTimeout=10, timeout=120000)
          if not vnc:
            print "Unable to connect to %s using password %s over VNC" % 
(unit['ip'], unit['passwd'])
            exit()
          return vnc
      elif unit['connection'] == 'vlc':
          apps.append(openApp('cvlc -f v4l2:///dev/video2'))
          return Screen(0)
      elif unit['connection'] == 'pi':
          pass
      return SCREEN

  issue faced:
  Running the script using command prompt. Able to connect the VNC and reboot 
the device upto 39th iteration without any issue, in 40th iteration its trying 
to connect the VNC but not connecting, there is no error messages, its 
strucking to connect the VNC. Verified this multiple times. Also verified this 
in sikuli 2.0.2 facing the same issue.

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