Center of Tall Grasses Dying Out - Why?

Laurel, DE(Zone 7a)

I have noticed that over the course of about 8-10 years the center of my tall grasses/miscast his die out and leave just an outer ring of growth. It has happened to all sorts of grasses even zebra grass.
Why does that happen and how can I fix it if possible?
Thanks in advance.
Candee

Contra Costa County, CA(Zone 9b)

I am not sure if there is a fix, short of digging them up and dividing them, keeping only the vigorous outside parts.

Laurel, DE(Zone 7a)

Thanks, that may be my only hope of spacing them.

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