Siri changes voice on its own (in certain cases, at certain times)

Hello Keith Gardner1,

Thank you for reaching out in Apple Support Communities. Let's ensure that your iPhone is updated to the latest version of iOS 16.0.2. Having the latest iOS version helps provide software improvements that can help. If needed, here's how to update the software:

Update your iPhone, iPad, or iPod touch wirelessly

1. Back up your device using iCloud or your computer.

2. Plug your device into power and connect to the internet with Wi-Fi.

3. Go to Settings > General, then tap Software Update.

4. Choose the software update that you want to install. You can choose to stay on iOS or iPadOS 15 and still get important security updates. Or you can choose the option to upgrade to iOS or iPadOS 16.

5. Tap Install Now. If you see Download and Install instead, tap it to download the update, enter your passcode, then tap Install Now. If you don't know your passcode, learn what to do.

These steps are outlined here: Update your iPhone or iPad - Apple Support

Now if the iPhone is updated to the latest version, we suggest to temporarily change the voice for Siri > restart your iPhone > re-select American (Voice 3.) Then test to see if that helps.

We look forward to hearing back from you with an update.

Kind regards.