I periodically login to this router and just the other day when I entered my user ID and password I was kicked out as the password was deemed incorrect. I tried a couple more times and then I noticed that after the password is entered when I press Enter key or click on "Log in" the string of asterisks in the password line doubles in length just before the login information is submitted. I have never seen anything like this before. The router was working and works again after a power off/on but the password issue remains. When I login to other Cisco devices such as Wlan access points the password line behaves normally and logins are successful. I wonder if there may be a solution to this. It looks like my only other option would be to reset to factory status and configure from scratch.
