Galaxy S8 notification bar goes up on it's own!

Every time I pull down the notification bar it goes up on it's own, even when I don't swipe up. Some times it does (and when it does some times it's instantly,as soon as I pull down the notification bar or some times it will stay and then go up on it's own) , some times it doesn't, but most of the time when I'm just trying to check a quick notification it swipes up on it's own. I've reseted my phone many times but I still get the same thing.
Is this just my phone been weird? Or a software thing?
Thank you.

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