Random notification sounds but no actual notification

It cannot be random. Try to find out when do you get notification sound? Under which circumstances for e.g.

• When Locked or Unlocked
• When on DND or Bed Time
• When your Text app is open or closed
• When your ringer is silent or enabled
• For a particular contact for all
• For VIP (Favourite) Contacts or all.

When an issue on an iPhone occurs randomly or cannot be consistently reproduced, it can be challenging to pinpoint the exact cause. In such cases, it’s helpful to carefully track certain details that could provide valuable clues.

Take note of the following:

• Recently downloaded apps: Which apps were recently installed or updated from the App Store?
• Currently running apps: What apps are actively running when the issue happens?
• Shortcut automations: Are there any custom automations set up in the Shortcuts app that could be affecting system behavior?
• Location: Does the issue occur at a specific place, like home, work, or when connected to a particular Wi-Fi network or Bluetooth device?
• Timing: Is there a particular time of day when the issue starts, or does it follow any specific schedule?
• Triggers: What specific actions seem to set off the issue—like opening a certain app, connecting an accessory, or changing a setting?

Documenting these details can go a long way in identifying patterns and ultimately diagnosing the root cause of the problem.

Expressing or conveying auditory experiences effectively through these forums may be challenging. The underlying sound issue on your iPhone cannot be accurately diagnosed from a YouTube link. Factors such as your iPhone's specific sound settings, visual defects, and potential hardware problems cannot be assessed through this method. For more personalized and in-depth assistance, I recommend securing a Genius Bar Reservation and exploring the various support options provided by Apple.

Get a Genius Bar Reservation and Apple Support Options - Apple

When you encounter issues with your Apple devices, the Genius Bar at Apple Retail Stores is the go-to place for expert assistance. The Genius Bar is staffed by knowledgeable Apple employees, often referred to as "Geniuses," who can diagnose and resolve a wide range of hardware and software-related problems. To ensure personalized attention and a convenient visit, Apple provides the option to schedule a Genius Bar Reservation.

Contact Genius Bar.

Manage Reservations - My Reservations - Apple