Don't destroy disconnectReason so quickly

src/Discord.Net/DiscordDataSocket.cs

@@ -42,7 +42,10 @@ namespace Discord
 			}
 			catch (OperationCanceledException)
 			{
-				_disconnectReason.Throw();
+				if (_disconnectReason == null)
+					throw new Exception("An unknown websocket error occurred.");
+				else
+					_disconnectReason.Throw();
 			}
 			try { _connectWaitOnLogin2.Wait(cancelToken); } //Waiting on READY handler
 			catch (OperationCanceledException) { return; }

src/Discord.Net/DiscordVoiceSocket.cs

@@ -109,7 +109,10 @@ namespace Discord
 			}
 			catch (OperationCanceledException)
 			{
-				_disconnectReason.Throw();
+				if (_disconnectReason == null)
+					throw new Exception("An unknown websocket error occurred.");
+				else
+					_disconnectReason.Throw();
 			}
 
 			SetConnected();

src/Discord.Net/DiscordWebSocket.cs

@@ -45,6 +45,7 @@ namespace Discord
 			await DisconnectAsync();
 
 			_disconnectToken = new CancellationTokenSource();
+			_disconnectReason = null;
 			var cancelToken = _disconnectToken.Token;
 
 			_webSocket = new ClientWebSocket();
@@ -78,8 +79,7 @@ namespace Discord
 				_webSocket = null;
 				byte[] ignored;
 				while (_sendQueue.TryDequeue(out ignored)) { }
-
+				
-				_disconnectReason = null;
 				_task = null;
 				if (_isConnected)
 				{