The server stops randomly, fix this ASAP!

This happened dozens of times in just a couple of days. I was too lazy to report it away, but I simply can't handle it anymore. Let me play in peace for crying out loud. Its giving me headaches that I need to wait a whole hour for my server to start, and when I'm having fun I just time out, and the server goes offline. I'm using 1.13.1 w/ the Bukkit plugin, and my internet service provider is a public company called Metkom. It's fast and efficent, I rarely have any problems with it. I can barely enjoy my gameplay with glitching animals and being randomly teleported, I don't need this on top of everything. I hope you can understand how annoying and repetitive this is, and maybe try to fix it.