[xXLegendaryXx]

Since your server running on a safe version, and its only "Server Shutting Down", it could only be your connection/host. If your hosting the server on a different computer, make sure it has a steady connection, or nobody is using that connection to download big files. If its hosted by a company, you can only contact them about this. If its a personal VPS, then you can look into it, what else is on the VPS or if anything else the VPS is used for.