Minor save data issues are not very common and are typically caused due to using the app in ways it was not intended to. Should you ever run into issues where your progress isn't being saved or has a minor rollback, please keep the following suggestions in mind:

• Always close the game properly when done playing, do not leave it running in the background.
• Do not use multiple devices to play on the same account. Never open the same account on two different devices simultaneously.
• Do not use multiple accounts on the same device. Constantly swapping accounts or using third party apps to have more than one instance of the game running will corrupt your data.
• Always use a stable Wi-fi connection to play. Unstable connections can cause issues with the game and uploading your progress data to the server.
• Make sure you have downloaded Dragons: Rise of Berk from the official app stores and it is up-to-date.
• Ensure your device's date and time is set to Automatic.