My Lg X Charge makes a constant ringtone noise

[Steeler77]

I dont know how but this random ringtone sound goes off at any given moment at any given time with no notification or anything i tried to silent it, wouldnt work, aslo tried the do not disturb aslo didnt work, i really have no idea how to stop this, also tried resetting, didnt work .

 

[B. Diddy]

Welcome to Android Central! Does it go away if you turn off NFC?