If your Samsung Smart TV is behaving out of the place, its a good idea to reset Samsung TV back to original factory setting to resovle the issue. for most of the Samsung tv's manufactured between 2012 to 2018 steps are same.
Steps to reset Samsung Smart TV to factory settings.
1. On your samsung smart remote, press the "MENU" button.
2. Select "Support" section displayed on the screen, click enter button in the middle of the remote's arrow buttons.