Annoying persistant "notification" sound

MeIsNotACat

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Sep 6, 2013
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For the past few hours, my nexus 4 keeps making some weird notifications sounds. The sound only stops when the screen is off, or the volume is mute/vibrate. Otherwise, the sound would be repetitive, like it would overlap. Its like a 2 tones sound. There's no notifications there and the sound keeps going. I tried restarting my phone but the sound is still present.The sound just won't stop when i open the screen and it's really getting on my nerve. Does anyone can help me, please?