HTC One M7 :: Speaker Shutting Down Or Turning Off Sound When Unlock Phone

I can't really seem to find the actual term, but the case is every time I unlock my phone the speakers seem to turn on for a moment, then shut down again, the problem is I always have the phone on vibrate, nevertheless this sound keeps appearing after doing certain actions, it's like a static noise, followed by a sound that resembles the speakers powering off. It's almost unhearable unless you pay attention, otherwise the speakers are flawless. Could fix some actions displaying it by going to settings, sound, and unticking pull-to-refresh sounds, however, the sound persists on unlocking screen.