My server restarts on its own / kicks everyone / rolls back periodically — why?

A server that restarts on its own, kicks everyone, or rolls back progress is doing so for a reason — and there are a handful of usual culprits. Working through them tells you which one you have.

Likely causes

• A scheduled restart you or a plugin set — check the Schedules tab and any restart plugin.
• OutOfMemory crashes cycling — check the Console for OOM (see the RAM answers).
• A crash loop from a mod or plugin — read the log for the repeating error.
• A watchdog killing a frozen server whose TPS dropped to near zero — fix the underlying lag.

About rollbacks

A "rollback" specifically means the server crashed before saving, so it reverted to the last save on restart. The fix is to stop the crash and save more often — once it stops crashing, the rollbacks stop too.

How to investigate

1. Check the Schedules tab for a restart you forgot about.
2. Read the Console for OutOfMemory or a repeating crash error.
3. If TPS is bottoming out, treat it as a lag problem (spark report).

Tip: Start with the Schedules tab — a self-set or plugin-set restart is the most common and most easily overlooked cause.

Frequently asked questions

Why does my server keep kicking everyone at once? Either a scheduled restart, an OutOfMemory cycle, a crash loop, or a watchdog killing a frozen server. Check Schedules and the Console to tell which.

What causes rollbacks specifically? A crash before the world saved, so it reverts to the last save. Fix the crash and save more frequently.