Panoramic modem keeps going from a steady green light to a blinking blue light (on the right side of the modem.

It might be acquiring either upstream or downstream channels.  Either way, it's losing its channels.  What's the make and model?  You could call Cox to assess your connection.  Beware of any service calls because it'll cost you.  During your phone call, if Cox suspects the modem, exchange it at your nearest Solution Store.

are you just setting it up?  takes a while!!

Hi Carolyna, is the light on your modem still blinking green as well as blue? The blink colors and patterns are described in the Cox Support article found HERE. If you aren't able to access the internet or you have further questions, please feel free to email us at cox.help@cox.com. -Becky, Cox Support Forums Moderator