As requested by the log, i paste the log here. there was 1 player online. Server runs Windows 2008 DC, Spigot 1.8.3 and has the following plugins: PorteCoulissante LWC LogBlock WorldEdit WorldGuard WorldBorder Essentials EssentialsChat EssentialsGroupManager DynMap MCBans My monitoring software (Zabbix) only detected the TCP ports of Minecraft and Dynmap going down. No strange CPU or disk or memory load. Both the Reliability Monitor as the Event Viewer show no errors.