@brebreeplays this type of problem is not caused directly by the APP, but by your device which, to free up space and maintain high performance, deletes the game data .. for this reason you have to re-download them every time you log in. The only fault of the game is that it takes up a lot of space.
There are two possible causes for this:
1) You have little space on your device; the solution is to delete APPs, photos, videos and anything else you don't use, in order to free up at least a couple of GB for the game
2) Your device, despite you have a lot of space, has targeted this app, because it takes up a lot of space, and deletes the data. To fix you have to go into the options and disable automatic data cleanup. For this I can help you, but you have to say what type of device you use to play
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NEVER FEAR, BAFAN IS HERE!
[Bafan The Wolfman]