Software update?

Use iTunes on a computer to download the newest iOS version.

How much free space is available on your iPhone?

And it has never been jailbroken, run a beta, or been rolled back?

Have you tried updating via your computer?

Hi

Go to iCloud make sure iCloud back up is on Then backup now over your wifi.

Then go to settings down to reset Restore iPhone back to factory settings.

Set back up over your wifi when it asks if you want to use iCloud backup Say yes to get your apps and data back this will get rid of any bugs.

Cheers

Brian 🇬-1F1E7;