Notification cooldown in Android 15 can not only lower the volume of successive notifications but also stop them from vibrating your phone.

Android 15 QPR1 could bring back the notification cooldown feature that gradually lowers the volume of successive notifications from apps.

Q: When my car and my Samsung Galaxy S5 phone connect via Bluetooth, the phone's notification alert tone goes off every 15 seconds. But when I check the phone, there are no notification messages ...