Bosch Smart Home Binding does not update item states

Hello folks,

does somebody notice the same problem when using Bosch Smart Home Binding with Door Contact Items. I do get an item of the contact item but the state is only once updated, in the moment I link it. Then it never changes again. Anyone an item why or knows how to fix this?
First I though about a refresh rate somewhere in the Bridge or Things configuration but did not find a word about it in the documentation.
In my Bosch APP the state is correctly chaning with a delay of approx. 1s only.

Thanks for any help/idea.

Br Daniel