I bought a new iPhone 16 Pro Max, and like everyone else, I started transferring data from my old iPhone. I needed to update the software, so I did. But after the update, when I turned on the phone and swiped up to enter my password to unlock it, the keypad appeared for a second and then disappeared immediately, making it impossible to enter the password. I decided to restart the phone. Normally, there should be three options: Power Off, Restart, and SOS. However, just like the keypad, they appear momentarily and then vanish. The phone also randomly either restarts or shuts down on its own. On top of that, the phone has heated up significantly, even though I haven't even started using it yet.