How can I stop this?

My iPhone will randomly start to play my ringtone but it remains on what I was viewing with no choice of being able to answer the phone so my ringtone is playing for no reason but can still be stopped by the lock button. Once lock button is pressed there's no missed calls visible. What's going on?

Well, there's no choice of being able to answer the phone because no one is calling - it's ringing randomly according to you. Can't answer a call that doesn't exist, right?

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