When your devices were booted off the Internet, were you getting timeout and a blank page in your browser? Or was something else happening?
You can’t get logs from the router management console. But you can use ssh to log in the router command line interface and use the ‘logread’ command to see the router logs. If you are comfortable doing that, you can send the output of logread to [email protected], and we’ll review it.
Just out of curiosity, how did you rule out the cable modem?