No, I don't think it's somehow related to repairs in NYC. Those repairs affect lines at large - when somebody there decides to switch large (really - large, like OC192 HUBs), amounts of lines from one equipment to another one. There are no "small" problems. And such "switch-overs" occur rarely (well, I wish we could be updated before they occur, but those who does it - don't even know about our "existence"
We're NOT aware of any calls being dropped, neither from iNUM, nor NY Free DIDs, nor any others.
Please open a ticket on your issue. I can't say from your description of what can be the cause, but it appears as something related to your setup only. Anyway - our support is trained to solve matters like this one while we have ability to capture all signaling and RTP when there is an issue to be resolved. Thank you.