The ongoing microsoftization of the Minecraft (Java edition) server codebase has degraded performance to the point where the primary server (with Survival and Creative servers) will no longer run reliably. Generally, things work okay but some operations end up taking too long and the server software’s internal heartbeat monitor times out which the program interprets as a crash and shuts down.
To be fair, the iron is ancient: a two-core AMD Phenom(tm) II X2 550 processor running at 3.1 GHz with 4 GB RAM. Now that I’m retired, I should have time to move to some more modern hardware. I have a box sitting around with 8GB, four core AMD A8 PRO-7600B R7 which should be a bit more comfortable. Stay tuned. Who knows, I might even be able to resurrect the minigames server.
Hardware upgrade is currently in progress. Any changes you make on the server will be lost when the new hardware launches!