Can a single contact name, be erased for no reason?

My step son thinks he is the most knowledgable kid in the world in every category! He claims he stores his moms name & phone # under his contacts, & saves it. Then for no apparent reason, it constantly erases her name & #, as if he never stored it all. He claims this keeps happening! I need someone with knowledge in this area, so i can confront him about why HE purposly keeps deleting her name?

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