Zeb, thank you for the updates!! I've been browsing the Comcast forums for the same issues; I'm seeing the same problems, but from 2013. x_x So, hopefully, Cogent and Comcast will (eventually) fix the problems.
The game was working fine for me last night, but this morning, starting at 6:30, I have had nothing but 'server not responding' issues. I'm playing in safe mode right now, but it seems even worse. I also use Comcast and live in Fl, but my internet is fine - my boyfriend constantly plays Destiny and he is having no problems.