Blinking light at back

Using xfinity modem.

light flashing near cable hookup.

powering “off” and waiting, then powering back “on” does nothing.

i think there is a stuck update. Xfinity AI (🤯) says there is no problem. 🤷🏻‍♀️

>>> anyone know what to do or a website address that addresses this issue?

yes. I have “intermittent” issues of that wonderful buffering image.