Why did my complete prairie merely mysteriously die? I recently mowed my prairie, and the footpath outside. It was...

I recently mowed my prairie, and the footpath outside. It was fine for a year or two, then we get some heavy precipitation overnight and then suddenly the full lawn be just unresponsive. It has never happen before.
Answers:    Maybe it be over watered, the same piece happened to me, but latter i found out my neighbor pored poison on it.....
Maybe someone thought you couldn't afford the cost of mowing your lawns all the time and took it on themselves to spray your meadow with something that kill the grass.