My phone keeps closing apps, pausing games on its own and putting the keyboard away. Help!

This has been happening for almost a week. I'll go to watch something on YouTube or on Twitch and my phone will go back to the home screen. I'll go to play a game and it will pause my screen in one place. Even as I type these details, my phone keeps putting my keyboard away as if i clicked the back button. I have a Samsung J7 and i dont know why my phone is doing this. Someone please help me!

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