Hey JustineNoona,
Sounds like your Settings app is crashing on your iPhone 13 mini when you try to connect to a Wi-Fi network. We'd be happy to help out.
To start, is this happening only with a specific Wi-Fi network? Is this your home WI-Fi network you're having trouble with?
Also, there is new software available, so it'd be a good idea to back up your iPhone and update to iOS 15.6.1 to see if the issue persists there. For help with doing so, check out these resources:
How to back up your iPhone, iPad, and iPod touch - Apple Support
Update your iPhone, iPad, or iPod touch - Apple Support
- "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 two software update options 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.
You might see that your device is up to date and that there's an upgrade available. For example, even if your device is up to date with the latest version of iOS 14, there might be an option to upgrade to iOS 15. You might want to upgrade iOS when you pair an accessory with iPhone."
We hope this information helps out.
Take care!