MariaDB connection is unstable

[cupang-afk]

sometime it stable, sometime it disconnect like this

i use default configuration for mariadb and has several plugin connect to it, but only dynamic difficulty has this problem

[23:19:21 WARN]: java.sql.SQLNonTransientConnectionException: (conn=157769) Connection is closed
[23:19:21 WARN]:        at DynamicDifficulty [1.9].jar//org.mariadb.jdbc.export.ExceptionFactory.createException(ExceptionFactory.java:293)
[23:19:21 WARN]:        at DynamicDifficulty [1.9].jar//org.mariadb.jdbc.export.ExceptionFactory.create(ExceptionFactory.java:370)
[23:19:21 WARN]:        at DynamicDifficulty [1.9].jar//org.mariadb.jdbc.Connection.checkNotClosed(Connection.java:687)
[23:19:21 WARN]:        at DynamicDifficulty [1.9].jar//org.mariadb.jdbc.Connection.prepareInternal(Connection.java:144)
[23:19:21 WARN]:        at DynamicDifficulty [1.9].jar//org.mariadb.jdbc.Connection.prepareStatement(Connection.java:118)
[23:19:21 WARN]:        at DynamicDifficulty [1.9].jar//me.skinnyjeans.gmd.databases.SQL.lambda$batchSavePlayers$2(SQL.java:106)
[23:19:21 WARN]:        at org.bukkit.craftbukkit.scheduler.CraftTask.run(CraftTask.java:78)
[23:19:21 WARN]:        at org.bukkit.craftbukkit.scheduler.CraftAsyncTask.run(CraftAsyncTask.java:57)
[23:19:21 WARN]:        at com.destroystokyo.paper.ServerSchedulerReportingWrapper.run(ServerSchedulerReportingWrapper.java:22)
[23:19:21 WARN]:        at java.base/java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1144)
[23:19:21 WARN]:        at java.base/java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:642)
[23:19:21 WARN]:        at java.base/java.lang.VirtualThread.run(VirtualThread.java:329)