We never activated our static IP and have been using DHCP for a couple years. I put the modem in bridge mode and tried setting up static on a new router a couple weeks ago it and it didn't work. The router works on DHCP fine. Can you issue a new IP address to see if a "fresh" number clears the problem?
I called support about this and they told me they'd look into and call me back... they never called back.
My apologies MichaelN, I am not able to find that private message. Are you able to try clicking on my handle (Comcast_Gina) and sending a private message that way?