Why is my iPhone 6s Plus acting weird?

My phone randomly started acting weird I first noticed it on Snapchat when I would press a story and it wouldn t play it would just go straight to the replay story circle or some will play but have a black screen for majority of it and some things on Twitter won't load and my messages were acting weird so I restarted my phone and all my messages got erased somehow.

Because you need the model X

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