Recently I started having issues with my home Wi-fi connection. My devices showed as connected to the router, but no Internet was coming through.
While trying to log into the router through my browser (at 192.168...), I found my password no longer worked. It was reset to the default password written on the side of the device. Note that settings such as my password for connecting devices to the Wifi was not reset. I did not use a paperclip to reset the modem.
While on the phone with my ISP's customer support, the agent thought the device was one rented out by the ISP, though I clarified it is my own device. Is it possible the agent could remotely reset the password on the router, without knowing what my own password was?
Otherwise, is a reset password a sign of a security breach? If so, what additional signs should I look for?