Failed to call hook 'OnPluginUnloaded' on plugin 'DiscordChat v1.0.2' (IndexOutOfRangeException: Index was outside the bounds of the array.) at System.Collections.Generic.Dictionary`2[TKey,TValue].TryInsert (TKey key, TValue value, System.Collections.Generic.InsertionBehavior behavior) [0x00156] in :0 at System.Collections.Generic.Dictionary`2[TKey,TValue].Add (TKey key, TValue value) [0x00000] in :0 at Oxide.Core.Plugins.HookCache.GetHookMethod (System.String hookName, System.Object[] args, Oxide.Core.Plugins.HookCache& cache) [0x00016] in :0 at Oxide.Core.Plugins.CSPlugin.FindHooks (System.String name, System.Object[] args) [0x00000] in :0 at Oxide.Core.Plugins.CSPlugin.OnCallHook (System.String name, System.Object[] args) [0x00004] in :0 at Oxide.Core.Plugins.Plugin.CallHook (System.String hook, System.Object[] args) [0x00060] in :0

Plugin fails to send msg when unloading other plugins in the console to discord errors. + Eats up 300MB of ram + Stops the discord service from finding you guild that the bot is in. Until you unload DiscordChat from your server. 

This is what it does after you unload the DiscordChat plugin extension.

Your DiscordChat version is 3 months old. I would try upgrading to the latest and see if that solves your issue.