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Hello @candy1302 , welcome to the King Community!
Lives can occasionally be lost with an update of the game, when the game crashes, after clearing the cache on the browser you play on or clearing the cache in the mobile app.
The mailbox can also be reset after various technical issues either in the browser you play on or on Facebook. On mobile technical issues either in the game itself or on the mobile device you are playing on can cause that the Lives are being reset.
Reinstalling the app on mobile devices or resetting the app on a Windows 10 PC will also reset the mailbox and all Lives will be lost.
Bear in mind also that if you have a huge amount of Lives stored for some time and do not use them, the game can clear the mailbox to free some memory to improve the game's functionality. Therefore we recommend to not collect hundreds of Lives or saving them for a longer time.