I have just tested RUT955 with the latest firmware, and bridge mode worked as expected. Please, try to reset your device and try to reconfigure the bridge mode.
If the issue persists after reset, please try to download and send me your router troubleshoot file. You can download it from the router's WebUI, System → Administration → Troubleshoot.
If you have configured Bridge mode and can no longer reach your router, you'll need to set up a Static IP address on your PC. If you don't know how to set up a Static IP, you can check out our how to guide on this subject: