So lately my server will crash. It starts up fine, I can play on it and other players can play on it then sometimes it suddenly crashes. A player was asking about the plugins and i said "do /plugins to see the ones i have installed" a few seconds later the server crashed, probably when he types /plugins. This also happened when a player typed /warps (essentials plugin) and /jobs browse (jobs reborn). Please help me with these server crashes. The plugins I have installed are:
ChestShop
ClearLag
Essentials
Essential commands
EssentialsChat
EssentialsSpawn
GriefPrevention
Group Manager
Jobs Reborn
Shop
Vault
WorldEdit