XB8 modem login password changed by Xfinity?

I have a XB8 modem from Xfinity where I have changed the default password to something I managed to remember.  I have been able to access this modem using my own password for years.  Today Xfinity notified me they had to do some service interruption due to issue with the network.  Naturally I noticed that the modem light changed color.  After service was back on (interruption of 10 minutes?), I tried to login to my modem and was not able to do so.  Anyone has this experience?

(note: yes I have changed my default LAN from 10.0.0.1 to 10.10.10.1 for years and was always able to login.)..  your help is very much appreciated.

Picture below is what I experienced.