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connection error with mobile robot Jaguar 4x4

Hello, I use the package (https://github.com/gitdrrobot/jaguar4x4_2014.git) to control the described robot in ROS Kinetic temporarily via the keyboard. Installation worked smoothly. But as soon as I control the robot via the keyboard, the robot moves for a few commands. Then the jaguar4x4_2014 node returns the message that the connection has been lost. It repeats after repeatedly opening the node. According to ping test, the wireless connection is good. Where can I go for troubleshooting within ROS? Or does anyone have any idea why the connection is lost as soon as I want to control the robot?