This began very early on in the server. We would be playing and it would crash and kick everyone off while displaying we were all still online. I noticed when it went to make a backup the server would crash from WatchDog. I disabled WatchDog and it seemed to help for a little bit but now the server will just crash randomly. Every time I try to fix this or read up on it it's a Spigot or Modded issue. This is a Vanilla server, however. I thought it was maybe the MineOS software so I uploaded the files and ran it on a Mac Mini running 10.15.7. The server acted the same. I tried redownloading the Jar. The same issue, I even tried running it on an old Windows computer I had in a drawer. Same issue.