Socket error

[serena-ivaldi]

[E] 1510575848.332518 5801 python: Traceback (most recent call last):
File "/home/bmounier/Documents/Pepper-conference-chair/Operator_controller/movement.py", line 120, in run
self.motion_service.setMoveArmsEnabled(True, True)
RuntimeError: Socket is not connected

This happens sometimes during tests, but it seems coming from Pepper, as even Choreographe cannot connect to Pepper. Basically this requires hard reboot of the robot.