I waited some weeks, but the autojettinson function doesn't work anymore.
I've tryed to reinstall the game, too.

We're gonna need more info, cause it appears to work just fine for me?

Please check the "How to submit a buig report", then include the following:
What device you're playing on
What version of the game (HD or non-HD, for android)
What you have selected in your auto-jettison menu (screenshots preferred)
What you're mining
a /time stamp of when you were having issues
Are you using plugins, or do you have them disabled (including have you restarted the game since disabing them?)