Welcome Christopher Wenom,
Thank you for reaching out to Microsoft Q&A forum. If Mahjong 3D is resetting your coins, hours played, previous day's scores, or high scores, it may be related to synchronization or local game data.
To help narrow down the cause, could you also let us know:
- Are you playing the Mahjong 3D game through the Microsoft Solitaire & Casual Games app or through a website?
- Does the score reset happen every day or only occasionally?
- Does the issue occur on only one device or on multiple devices using the same account?
In the meantime, please try the following steps:
- Make sure you are signed in to the game with the same Microsoft account each time you play
- Close the game completely and restart it
- Verify that your device's date, time, and time zone are correct under Settings > Time & Language > Date & Time
- If you are playing in a web browser, test the game in an InPrivate/Incognito window or a different browser to see whether the issue persists
I look forward to your update.