Please try the following suggestions:
  1. Restart your device.
  2. Check that you have a stable internet connection
If the problem still persists, contact our customer support and provide the following information:
  1. A detailed description of the problem
  2. Your game ID (found in the game Settings)
  3. The level you were at.
  4. What happened before your progress was lost (reinstalled the game, updating the operating system, etc.).
Please provide as much information as you have, as it can speed up the whole issue-solving process.