Issues to execute two macros on two separate workbooks (but same macros) on the same time

Hi,

first, I write from Paris so apologizes for my english.

I try to launch two macros on the same time with Excel 2016. the 2 macros are located into two separate workbook and do the same code. It works in excel2007.

I have already tried to launch each workbook into new excel instance but even with that, the two macros block themselves.

Here is the code of the macros :

Sub Lancement_Simul()

'Initialisation
Set xlapp = CreateObject("excel.application")
Dim Filename As String

Output_Doc = [Output_Rep]
Model = [Model]  'name of file .xlsm
Model_Rep = [Model_Rep] 'folder where the file is

'Suppression des check
ThisWorkbook.Activate
Worksheets("Launch").[Check_Simu].Select
    Selection.ClearContents

'Ouverture du moteur de calcul
Workbooks.Open Filename:=Model_Rep & "\" & Model

' Lancement_Simul Macro
Application.DisplayAlerts = False
ThisWorkbook.Activate

For i = [Min_Simu] To [Max_Simu]

Workbooks(Model).Worksheets("HypAlm").Activate
[Simu_Stocha] = i
Application.Run "'" & Model & "'" & "!Alm"

' Alm is a other macro into another file to be executute


One excel file will call Lancement_simul() with Model as file1.xlsm

second excel file will call Lancement_simul() with Model as file2.xlsm

Separately, the both executions are ok. on the same time (but into two excel different instances), the macros blocked.

any ideas, how can I solve my issues?

thanks for your future answers.

Rgds,
seb