I caught sight of this across the room last weekend. It startled me because this plant hasn’t grown in several years.
I haven’t changed anything–pot or soil–and I don’t fertilize so that’s not it.
Certain plants sense things like when they are going to die and they put out seed. Other plants, like oak and pine, have heavy mast years and lighter ones. This leads to abundant years for small mammals like chipmunks and squirrels. In leaner years, fewer chipmunks and squirrels (although most gardeners will tell you that there’s always too many).
But I really have no explanation for this sago palm deciding that it will do this now.
Maybe it decided that I needed something to cheer me up.
Gardendaze 
Sago palms can do that. Even in the garden, the do not seem to have much regard for the seasons. They just do this whenever they want to.
In this year of everything else going weird, why not the sago palm? But plant weird at least I can handle.