This is likely our issue, published yesterday:

Verizon Wireless's chief financial officer Fran Shammo said today that customers are seeing lower data speeds due to "capacity constraints" in big cities, a rare admission for the carrier.

The rapid growth of data usage is outpacing infrastructure in cities such as New York, San Francisco, and Chicago, Shammo said at a conference today.

http://www.theverge.com/2013/11/12/5097454/verizons-wireless-network-is-straining-under-demand-in-bi...