Notification sounds from other devices on my Bluetooth Speaker and playback stops

The multi-device connection feature of your Bluetooth® speaker allows pairing with more than one audio source.
However, only one device at a time can play audio.

If you listen to audio from your mobile device and another paired device plays a notification or operation sound, the speaker input switches to the other device and playback from your mobile device stops. To keep your audio playback from being interrupted, disconnect the other device from the speaker.