Hi MrFosterLee,
For help with alerts and alarms on your iPhone, be sure to check your Attention Aware settings on your iPhone. The steps below found in the article here can assist: Turn Attention Aware features on or off on your iPhone or iPad Pro
"What are Attention Aware features?
Even if you don’t enroll in Face ID, the TrueDepth camera* intelligently activates to support Attention Aware features. With Attention Aware features, iPhone can check whether you’re paying attention to your device and automatically take action. For example,
- When you’re looking at your device, your display will not dim until you stop looking at your device.
- If you're looking at your device, it will lower the volume sound of your alerts.
If you don’t want to use these features, open the Settings app, tap Face ID & Passcode, then turn off Attention Aware Features."
You can also find helpful information here: Adjust the volume on iPhone, and check your Focus settings with the article here: Use Focus on your iPhone or iPad
If the issue continues and your iOS is fully updated, reach out to Apple Support directly to further assist.
Contact - Official Apple Support
Contact Apple for support and service - Apple Support
Best.
