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@TheBrick(Tommy)
Could you please rewrite this bit again please
"this is the second time this happens now: chain comes because the lock ring and sprocket get loose,"
It does not make any sense to me.
The hubjub link is a correct tool to do up the lock ring, although if it has come undone several times I would not be suprised if you had striped some threads by now.
Your chainline may be off but it should not be with a newish bike like yours so it prob is your chain tension it too slack, you don't want it too tight either. This is prob what is causeing your chain to come off. Google sheldon and chain tension.