My iPhone 13 Pro frozen on me 2 times n 3 days ☹ ☹ ☹

Why does my iPhone not turn on? The second time this week,

it's frozen, and I had to do the following

1. Press and quickly release the volume up button.
2. Press and quickly release the volume down button.
3. Press and hold the side button until you see the Apple logo

This is really concerning and causing inconvenience.