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You won't lose gold bars by deleting the game as they are synced along with progress. Messages containing lives and boosters on the other hand are only locally stored so of course you will wipe them if you reinstall the game, it literally say that in every troubleshooting out there. Anyway it sounds like you're not the only having issues with being kicked off when in the mailbox so keep an eye here: https://care.king.com/en/candy-crush-saga/what-happened-to-the-help-from-friends-envelope-in-the-right-hand-top-corner-of-game-when-i-open-th