Why is Siri unresponsive or cutting out on my new iPhone 16 Pro Max?

I finally upgraded my iPhone 12 to the iPhone 16 Pro Max. I use Siri a lot. Siri is not working well at all. She won't respond to "Hey Siri", or I have to raise my voice, or she starts to respond and then fades out. I have also had a number of phone calls at my home drop which I did not with the iPhone 12. I see this is a common complaint. Has iPhone addressed the Siri issue? Does anyone know the problem? I just purchased this phone in April 2025. Will Apple support be of any assistance?

[Re-Titled by Moderator]