Sorry to hear that! Do you have any anti-virus/security features on your phone that might try to block "suspicious" programs? This is a problem many mobile uses face. Otherwise, do you get any error messages at all when the game closes?
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That does sound like an automatic security response, but I don't know what your phone might have. If you could try to see if there's some kind of "quarantine" program, or something like that, might be what's causing the issue. If not, we'll have to look into something else. Thank you for your patience!