pymapdl: Execution stops due to Intlel(r) Visual Fortran run-time error

I am running a transient thermal analysis model, but while the model runs through a few loops, I get prompted a message that there is a Visual Fortran run-time error, it says sth like “forrtl: severe(47): write to READONLY file” and the execution stops. When I press ok, I get the following messages in my Python IDE. Do you have any idea why? The model used to run without problems up until a month ago. The steady state model runs without issues.

  File "D:\Python_projects\opto-thermal-transient-new\opto_thermal-loop.py", line 227, in <module>
    ansys.run("*ENDDO")

  File "C:\Users\E.Chatzizyrli\AppData\Local\Continuum\anaconda3\lib\site-packages\pyansys\mapdl.py", line 250, in __exit__
    self._parent._flush_stored()

  File "C:\Users\E.Chatzizyrli\AppData\Local\Continuum\anaconda3\lib\site-packages\pyansys\mapdl.py", line 1237, in _flush_stored
    out = self.input(tmp_inp, write_to_log=False)

  File "C:\Users\E.Chatzizyrli\AppData\Local\Continuum\anaconda3\lib\site-packages\pyansys\mapdl_functions.py", line 52375, in input
    return self.run(command, **kwargs)

  File "C:\Users\E.Chatzizyrli\AppData\Local\Continuum\anaconda3\lib\site-packages\pyansys\mapdl.py", line 1730, in run
    text = self._run(command, **kwargs)

  File "C:\Users\E.Chatzizyrli\AppData\Local\Continuum\anaconda3\lib\site-packages\pyansys\mapdl_corba.py", line 317, in _run
    text = self._server.executeCommandToString(command)

  File "C:\Users\E.Chatzizyrli\AppData\Local\Continuum\anaconda3\lib\site-packages\ansys_corba\ICoMapdlUnit_idl.py", line 206, in executeCommandToString
    return self._obj.invoke("executeCommandToString", _0_AAS_CORBA.MAPDL.Solvers.ICoMapdlUnit._d_executeCommandToString, args)

EAnsysUnknown: AAS_CORBA.MAPDL.Exceptions.EAnsysUnknown(code=-15, description='Low-level communication error -15: Connection was closed', scope='MAPDL', interfaceName='ICoMapdlUnit', operation='executeCommand', moreInfo='/INPUT,C:\\Users\\E972B~1.CHA\\AppData\\Local\\Temp\\tmp_rhwviqftot.inp,,,,')