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Galaxy Note Phones

Hearing audio feedback from speaker without music/video playing and screen is off/phone locked.

Buzzing/ticking sound.
Also, audio from a video will play while screen is turned off after using apps such as TikTok. 
 
Ran diagnostics. 
Came back normal.
Closed all apps and disabled developer options. 
Only stops when notification is received or restart. 
Comes back after any other audio is played such as apps. 
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