said by mkaishar:
It will be fixed tomorrow morning and broken tomorrow night
The problem is plain and simple, they oversold and did not build it to support the overload.
Do you have any proof of this? This is not cable. Someone with more tech details may weigh in here with the exact specs, but I believe it is highly unlikely that - if no hardware is broken - users could saturate the FiOS backbone.
More likely that there's a broken piece of equipment that is limiting the amount of traffic and you're seeing symptoms during peak hours than it being an unsolvable systemic problem.