From what you've said, with other people in your area having the same problem, I'd say it's an overload situation - too many subscribers on the same node. I'm not familiar with the terminology used here, but what's needed is additional equipment on Cablevision's lines in your area to distribute the load.
My opinion of Cablevision has changed drastically in the last year. One problem after another, one story after another. An absolute lack of communication between departments. I'm not sure what they need, but baffling me with BS is getting old. I do agree that they need to upgrade their equipment, but if you could see how they operate, you wouldn't see them doing that in the near future. You can only put so many patches in any system, sooner or later the balloon will just burst.
Yesterday, another tech was here with one of their new meters and he saw no errors. As soon as he left, I lost the Net and had to do a complete reboot. Then, an hour or so later, I'm watching a streaming NetFlix show and it rebuffers. Normally, this never happens with my BD players. I looked at the cable modem and all the lights were out. As I sat there and watched, they all came back on and the NetFlix show came back on. Sense my frustration?