[Turtlebot3 Waffle Pi] Disconnects from the Internet

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I am using ROS1 Kinetic with my Ubuntu 16.04. I also have Turtlebot 3 Waffle Pi. The setup was completed.

Here is the scenario I encounter,

First I start the roscore by

roscore

Then, I connect to my robot by SSH using the IP address. Then, I start the connection between my computer and the robot using

roslaunch turtlebot3_bringup turtlebot3_robot.launch

On my computer, I launch SLAM package by

roslaunch turtlebot3_slam turtlebot3_slam.launch

then, I launch the teleoperation package by

roslaunch turtlebot3_teleop turtlebot3_teleop_key.launch

I start to control my robot on the floor using the keyboard, and everything looks fine, but the robot doesn't sometimes stop when I press "s" to force stop. It proceeds its movement for 2-3 seconds. Then, it stops. Also, the SLAM values stop to publish on the terminal. This problem also occurs when I use navigation packages. The robot misses the goal position and keeps moving which is out of the plan. After sometime, it replans the path to reach the goal again. My guess is the robot disconnects from the Internet. Then, it reconnects. How can I solve this issue?