are there any news on this topic? Are the submitted bug-reports evaluated?
Since yesterday (21.01.15) a new kerio connect version (8.4.1) is out.
However there is no exact fix for this problem mentioned in the changelog/release history.
But anyway, I would try an upgrade and see if this fixes the problem.
Please report back, because this behaviour is what keeps me from upgrading our 8.3.4 installations
EDIT: Somehow I didn't see PetMik's reply...he was a little bit faster..sorry.