Hi,
The issue must be originating from the router's Firmware, because I can't see anything wrong with the device from the RMS point of view (except that it is offline).
To help determine what the issue might be, please provide the router's Troubleshoot file. It can be downloaded from the WebUI, System → Administration → Troubleshoot section.
The Troubleshoot file contains the router's logs and configuration files. Any passwords present in the configuration will be blurred out automatically in the Troubleshoot file, but some other info (like phone numbers) will be visible. If your router's configuration contains any such info, I recommend removing it before downloading the Troubleshoot file and uploading it here.