WDS causes outage in wired LAN

Hi!

I have got a massive problem when setting up a wds:


I am using two RB433 as a transparent WDS-bridge to connect devices in another building.

One of them has access to the “wired” Network and the other one is connected to some other devices by wire. WDS and the ethernet interface are assigned to a bridge.

When I start that setup, the whole network goes down after some minutes. I can just access fewer and fewer devices.

There is no loop and RSTP is enabled, too. If i “route” instead of “bridging”, there is no problem.
The APs are configured as “ap bridge” on 802.11n. WDS mode dynamic.

Do you have any idea, what is happening?
The same setup with a “funkwerk”-bridge does work without any problems.

Thank you for your help
Stril