What you see
- Restore Paused. Restoring from iCloud will resume when this [device] cools down.
What it means — Apple
If your device exceeds a certain temperature threshold while restoring from an iCloud backup, your restore might pause temporarily.
This pause keeps your device within an acceptable operating temperature. Your restore will resume when the device cools down.
Read the full article for pictures and model-specific details: If your iPhone or iPad gets too hot or too cold ↗