Apps closing by themselves?

Hello! So I found out that sometimes my apps seem to close themselves out of the . multitasking. I mean you know when you tap that button(square one usually for recent apps) where the apps are like a list and you can scroll through them and close them out if you want. Well recently I noticed some apps disappearing from there as if I closed them but I don't remember closing them. I mean I could have accidentally while scrolling through them just swiped left or right and closed an app without...

Apps closing by themselves?

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