Hi there imruh,
You've taken a couple great steps already with your iPhone 14. Besides restarting, another step you can take is to ensure your iPhone 14 is fully up-to-date. As updating to the latest version of iOS can sometimes resolve unexpected issues. If needed, the steps below show how:
"Update your iPhone or iPad wirelessly
- Back up your device using iCloud or your computer.
- Plug your device into power and connect to the internet with Wi-Fi.
- Go to Settings > General, then tap Software Update.
- If you see more than one software update option available, choose the one that you want to install.
- 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."
Those steps are from this article: Update your iPhone or iPad - Apple Support
Please let us know if that helps or if you've already updated your iPhone, as that can help us determine possible next steps.
Take care!