40 - 50ms is not a high ping. Cablevision conisders anything over about 150ms high.
When you cannot connect to the office can the office access the web? Usually at businesses cablevision supplies a dumb router for the static ip. With my experience if that goes you would also have problems with the pc's behind it accessing the net.
The cablevision router is a cisco router. I have a router (Netgear) for running a LAN in the office which uses one of the static IP addresses. The PC's can connect to the Internet. But if I check whatismyip I see that the IP on my computer changes from the proper static IP to the IP for the LAN. Is that the source of the problem?
No, that is common - I see it with dyndns and whatismyip sometimes where it returns the local IP, but it does not cause any problems. -- NOTHING justifies terrorism. We don't negotiate with terrorists. Those that support terrorists are terrorists.