Ringtone Playing Randomly

I've had this phone for a few months now and I've noticed one weird thing about mine. The default LG "Life's Good" ringtone will just up and play at random times. Some times twice within one second of the other one starting. No one is calling me, there's no notifications up in the status bar, all my ringtones and notification tones are different from the defaults. I can't figure this out. Anyone else experience this?

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