USB Issues with D/Port Advanced Port Replicator / D600

I'm trying to connect my phone (Panasonic KX-T7636) with an USB-Cable and the corresponding drivers (Panasonic KX-T7601) to my Dell D600 via USB.

If I'm not docked into my D/Port APR, everything works perfectly fine. When I'm docked in, the Panasonic USB-Driver seems to have many issues (not recognizing the phone, blue-screen, hanging screens, other crashes) and prevents my whole system from working.

I upgraded already NSS, but it didn't help.