I don't know why, but my server stopped responding 3 times.
I'm not sure if it's a Spigot problem or PC problem, because I had a lot of programs running, (another Spigot and BungeeCord server, Chrome...) and whenever the server stops responding, my FPS drop as well; but it never happened on (the plenty of) other servers I made.
Console error:
[21:42:28 ERROR]: The server has stopped responding! [21:42:28 ERROR]: Please report this to http://www.spigotmc.org/ [21:42:28 ERROR]: Be sure to include ALL relevant console errors and Minecraft crash reports [21:42:28 ERROR]: Spigot version: git-Spigot-db6de12-18fbb24 (MC: 1.8.8) [21:42:28 ERROR]: ------------------------------ [21:42:28 ERROR]: Server thread dump (Look for plugins here before reporting to Spigot!): [21:42:28 ERROR]: ------------------------------ [21:42:28 ERROR]: Current Thread: Server thread [21:42:28 ERROR]: PID: 16 | Suspended: false | Native: false | State: RUNNABLE [21:42:28 ERROR]: Current Thread: Snooper Timer [21:42:28 ERROR]: PID: 12 | Suspended: false | Native: false | State: TIMED_WAITING [21:42:28 ERROR]: Stack: [21:42:28 ERROR]: java.lang.Object.wait(Native Method) [21:42:28 ERROR]: java.util.TimerThread.mainLoop(Timer.java:552) [21:42:28 ERROR]: java.util.TimerThread.run(Timer.java:505) [21:42:28 ERROR]: ------------------------------ [21:42:28 ERROR]: Current Thread: Attach Listener [21:42:28 ERROR]: PID: 5 | Suspended: false | Native: false | State: RUNNABLE [21:42:28 ERROR]: Stack: [21:42:28 ERROR]: ------------------------------ [21:42:28 ERROR]: Current Thread: Signal Dispatcher [21:42:28 ERROR]: PID: 4 | Suspended: false | Native: false | State: RUNNABLE [21:42:28 ERROR]: Stack: [21:42:28 ERROR]: ------------------------------ [21:42:28 ERROR]: Current Thread: Finalizer [21:42:28 ERROR]: PID: 3 | Suspended: false | Native: false | State: WAITING [21:42:28 ERROR]: Stack: [21:42:28 ERROR]: java.lang.Object.wait(Native Method) [21:42:28 ERROR]: java.lang.ref.ReferenceQueue.remove(ReferenceQueue.java:143) [21:42:28 ERROR]: java.lang.ref.ReferenceQueue.remove(ReferenceQueue.java:164) [21:42:28 ERROR]: java.lang.ref.Finalizer$FinalizerThread.run(Finalizer.java:209) [21:42:28 ERROR]: ------------------------------ [21:42:28 ERROR]: Current Thread: Reference Handler [21:42:28 ERROR]: PID: 2 | Suspended: false | Native: false | State: WAITING [21:42:28 ERROR]: Stack: [21:42:28 ERROR]: java.lang.Object.wait(Native Method) [21:42:28 ERROR]: java.lang.Object.wait(Object.java:502) [21:42:28 ERROR]: java.lang.ref.Reference.tryHandlePending(Reference.java:191) [21:42:28 ERROR]: java.lang.ref.Reference$ReferenceHandler.run(Reference.java:153) [21:42:28 ERROR]: ------------------------------ [
Plugins I was using: AntiSwear, ChestCommands, ColoredSigns, CommandsDispatcher, CTNSC, Essentials, FastAsyncWorldEdit, Multiverse-Core, MysqlEcoBridge, Parkour, PermissionsEX, ReporterGUI, Socket4MC, SpawnJoin, SurvivalGames, TTA, Vault, VoidSpawn, WorldEdit and WorldGuard.
Thanks for helping me! I am not a Spigot expert (it was probably noticeable 
) and I'm not English, I hope you understand what I say.