Hello pankaj245,
Thank you for reaching out in Apple Support Communities. If you haven't tried yet, we recommend that you restart your iPhone. This can help resolve unexpected behavior. If needed, here's how:
1. Press and hold either volume button and the side button until the power-off slider appears.
2. Drag the slider, then wait 30 seconds for your device to turn off. If your device is frozen or unresponsive, force restart your device.
3. To turn your device back on, press and hold the side button (on the right side of your iPhone) until you see the Apple logo.
These steps are outlined here: Restart your iPhone - Apple Support
In addition, let's ensure that your iPhone is updated to the latest version of iOS 16.0.2. This provides software improvements that may help. Here's how:
Update your iPhone or iPad 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.
Also, does the same behavior occur if you change to a different lock screen or wallpaper?
We look forward to hearing back from you with an update.
Kind regards.