Re: T3 and T4 errors on with CM700 Modem. Customer Service says ¯\_(ツ)_/¯
Did you ever get resolution?
I have similar errors on my CM700, same hardware/firmware versions. I'm in a detached single-family residence with an overhead cable drop. No other devices, not even the set-top box for TV. The chat person just "reset the firewall" on my modem...but hasn't shown up on the event log. I was then told to contact the manufacturer, which of course directs back to Xfinity.