My advise id, you can go at apple store for a diagnosi, but it will be not a hardware issue.I have the same problem. 16 Pro Max.
I hope everybody with this issue sends a feedback to Apple. This is unacceptable.
In most jurisdictions now, you can't be holding a phone while making a call in your car. So using the side button is not an option. If you're in a car that doesn't have a CarPlay, you are essentially prevented from using the basic functionality of your phone.
if you are still in the 15 day , ask to change the device.
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