Why does my Samsung Galaxy J5 makes a sound but no notifications for anything?

"Samsung J5. Makes a sound but no notifications for anything. Its not a sound i use for any other notifications. Didnt used to happen, havent changed any settings. Mostly happens when phone just unlocked, sometimes repeatedly?"

Hi Kelly. When you hear the sound again, can you check if your phone detects a Wi-Fi network it can connect to? Also, did you install any app before that started happening?

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