How do I fix my iphone?

I have an iPhone 6s Plus. My phone keeps exiting out of apps on its own and it's annoying. I've had it for about a year now and it recently started doing this about a week ago. I've tried deleting apps I don't use. I have about 50 apps on there now. I don't know what the problem is. My screen isn't cracked and I never dropped it in water. Does anyone know what might be causing this to happen? I'd rather now buy a new phone if I can fix this issue.

Take it to the apple store

See if your out of memory.

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