Flight Labels missings


Hi Flightaware,
I was tracking departures and arrivals flights into JFK this morning around 8am New York time and noticed that a lot of the blue aircraft i.e. local aircraft did not have labels. The flights in the vicinity green aircraft did display labels.
Last night around 7pm New York time i noticed that flightaware was down for upgrade/maintenence.
Is this the reason why most local aircraft are not displaying labels?
I enjoy your JFK airport tracker and just hope this is temporary teething problem caused by the upgrade.