It's unfortunate to hear that you're experiencing charging issues with your iPhone 12 Pro after updating to iOS 16.6. Charging problems can occur due to various factors, including software glitches or hardware-related issues. To troubleshoot the problem, try the following steps:
1. **Check the Charger and Cable:** Ensure that the charging cable and adapter are in good condition and free from damage. You may also try using a different charger and cable to see if that resolves the issue.
2. **Clean the Charging Port:** Sometimes, dust or debris can accumulate in the charging port, affecting the connection. Gently clean the port using a soft, dry brush or compressed air.
3. **Restart the Phone:** As you mentioned, restarting the phone with the charger plugged in resolves the issue temporarily. Continue doing this until further troubleshooting is performed.
4. **Check for Software Updates:** Ensure that your iPhone has the latest iOS version. Go to "Settings" > "General" > "Software Update" to check for any available updates and install them if necessary.
5. **Reset All Settings:** If the issue persists, you can try resetting all settings on your iPhone. Go to "Settings" > "General" > "Reset" > "Reset All Settings." This won't erase your data, but it will reset all settings to their default values.
6. **DFU Restore:** As a last resort, you can try performing a DFU (Device Firmware Update) restore on your iPhone. This will completely erase the device and install a fresh copy of iOS. Make sure to back up your data before attempting this step.
If none of these steps resolve the issue, it's best to contact Apple Support or visit an Apple Store for further assistance. They can run diagnostics and provide specific guidance tailored to your device's situation.
Remember, charging issues can have various causes, so it's essential to isolate and address the specific problem to ensure proper charging functionality on your iPhone 12 Pro.