Terminal disconnect each 5 seconds and simulation can't launch in 2 specific courses

Hello, i have a problem of intempestive disconnections of the terminal, happening each 5 seconds in the “Unit 3: Services in ROS” and the following one " Using Python Classes in ROS", meaning the units with the sphero simulation. All the other units work fine, so it’s not a problem of my connection.

The last thing i did was :
Execute the following Python code [simple_service_server.py] to launch the service server.
I did stop kernel afterward to compare the rosservice list.

Thank you.

A post was merged into an existing topic: Simulation and Terminal will not load/connect