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I'm thinking this might have something to do with the sever weather last winter. It's not unusual for variegated plants like zebra grass to revert to a non-variegated form in response to stress. If the variegation doesn't return naturally, you have a choice of leaving it solid, or replacing it with a variegated form. Here's some general information: https://www.gardeningknowhow.com/ornamental/foliage/maiden-grass/care-for-zebra-grass.htm

The fluffy seeds of zebra grass, which you will want to harvest, look like this:
http://pics.davesgarden.com/pics/2003/10/29/Toxicodendron/d68633.jpg

For more information on the care of zebra grass, please visit the following link:
https://www.gardeningknowhow.com/ornamental/foliage/maiden-grass/care-for-zebra-grass.htm

Early spring is the best time to divide and transplant zebra grass. If you are in a warm climate, you could probably also do so in the fall.

Cool Season grasses should be cut in the spring.

These articles will help you.

https://www.gardeningknowhow.com/ornamental/foliage/ornamental-grass/ornamental-grass-falling-over.htm
https://www.gardeningknowhow.com/ornamental/foliage/maiden-grass/care-for-zebra-grass.htm

I wish I had a picture! Usually ornamental grasses aren't seriously bothered by pests with aphids and mites causing minor issues but you could have a burrowing animal at work. Voles, for instance, eat grass roots and woodchucks dig good-sized tunnels to their burrows. If it goes right under your grass, that's it. If the plant has been in place over 5 years, I would dig the entire clump up and examine the roots for problems. Divide out the dead portions and replant after amending the soil. Make sure not to bury the crown as this will kill it. While they like lots of water, they also need well-draining soil or their roots will rot. While the plant is out of the ground, consider checking drainage by doing a soil percolation test.

Feed zebra grass lightly every spring, using a light application of a balanced, general-purpose garden fertilizer. A second application is necessary only if the zebra grass displays weak growth or if the foliage takes on a pale, yellowish color. Refer to the fertilizer container to determine specific rates of application.
Cut zebra grass down to within 5 inches before new growth emerges in spring. Removing old growth keeps the plant tidy and makes room for healthy new growth. Don't cut the plant down in autumn, because the foliage provides interest to the winter landscape.
https://www.gardeningknowhow.com/ornamental/foliage/maiden-grass/care-for-zebra-grass.htm