Phone ringtone keeps going off but when I check it nothing's there?

My phone, an LG K30, keeps sounding its ringtone and notification tone when I'm not being called and there's nothing to notify me about. I know it's NOT the phenomenon where you think it's vibrating or sounding when it actually isn't because the rest of my family can hear it too.

What can I do to fix this?

Anonymous2018-10-06T18:35:51Z

start by looking in the owners manual and maybe removing the battery for a minute then reinstalling it