Hey there TonyP58,
Thanks for reaching out.
If this only happens with notifications, test to see if you can change the alert sound and hear the notification as expected. This will help if it's a specific alert tone that's affected.
For help with changing the alert tone: Change message notifications on iPhone - Apple Support
If this persists, try these steps to resolve the issue here:
If you prefer, here are some more steps you can try on your own. After following these steps, you might still need to contact Apple Support to discuss service options.
1. Remove all screen protectors, films, or cases from your device.
2. Check the speaker opening to see if it's blocked or dirty. On iPhone only, make sure that the receiver isn't blocked or dirty.
3. If necessary, clean the speaker or receiver opening with a small, soft-bristled brush. Make sure that the brush is clean and dry.
4. Go to Settings > Sounds (or Settings > Sounds & Haptics), and drag the Ringer and Alerts slider back and forth a few times. If you don't hear any sound, or if your speaker button on the Ringer and Alerts slider is dimmed, your speaker might need service.
5. If you hear sound, try making a call with your iPhone and turn on speakerphone. On iPad or iPod touch, make a FaceTime call. If you still can't hear, or hear static or crackling, then your network or reception could be the issue. Try to call again later, or from a different location.
If you hear no sound or distorted sound from your iPhone, iPad, or iPod touch speaker - Apple Support
You'll want to Contact Apple Support directly should the volume continue to sound lower than expected.
Take care!
