The day the Earth stood still?

A funny thing happened here in 'Vegas on Friday.
Almost no one's remote-car-entry key fob worked.
It was reported on the news but I doubt it got national attention.
There has been the usual Nellis (AFB) and Area-51 connection-speculation.
Reportedly, this condition happened in Washington state at a town near a Navy installation.
The weather, in 'Vegas, was typical except for an overcast sky.
Any RF experts want to take a shot at this?