For now I ended my test.
Results:
Test 4 - "Closing" time: 70 ' - NOT OK -
Test 5 - "Closing" time: 40 ' - OK -
Test 6 - "Closing" time: 60 ' - NOT OK -
It seems that there is a critical time of approximately 1 hour.
While other devices do not have this situation as insufficient.
So for my case I can hope that in future we may discover other useful workarounds, tips and tricks .