Here's the fix:
- Swipe up from the bottom (or double-tap home on older iPhones) to open the app switcher.
- Swipe Dilly away.
- Tap Dilly to reopen.
If it freezes again right away, email support a screenshot and what you were doing when it happened.
Troubleshooting
Force-close and reopen first. If it keeps happening, email support with a screenshot.
If it freezes again right away, email support a screenshot and what you were doing when it happened.