You are in the same boat as several users. This has been ongoing and Comcast will not do anything to help.
I think that the problem is that the wifi hotspots are controlled by the "owners" of the equipment that serves the area. Once something goes wrong, a quick reboot would likely solve any issues. But if the "owners" aren't seeing a problem then why reboot? Then you are stuck till they do.
I've been unable to connect for about as long as you I'd guess. It's a bit stupid that Comcast can't reboot their own equipment (the rentals) to keep wifi hotspots going. But I don't expect much from Comcast.
