Greetings.

We're seeing a strange issue (not frequently) since last 2-4 weeks while acknowledging a message using message consumer.

It's throwing an error while acknowledging the message:

The method MQCMIT failed.

A IBM MQ call failed.

StackTrace =    at IBM.XMS.Client.WMQ.WmqSession.Syncpoint(Boolean commit, Boolean fromOnMessage, String methodName)

at IBM.XMS.Client.WMQ.WmqSession.Commit(Boolean fromOnMessage)

at IBM.XMS.Client.Impl.XmsSessionImpl.CommitTransaction()

at IBM.XMS.Client.Impl.XmsMessageImpl.Acknowledge()

            // Get an instance of factory.
            xmsFactoryIn = XMSFactoryFactory.GetInstance(XMSC.CT_WMQ);
            // Create WMQ Connection Factory.
            connectionFactoryIn = xmsFactoryIn.CreateConnectionFactory();
            // Set the properties

            if (MQMode == (int)Location.Local)
            {
                LogMessage($"CreateConsumerIn: MQ Location=Local ", Tracing.LogCategory.Debug, Tracing.LogLevel.DebugLow, null);

            }
            else if (MQMode == (int)Location.Remote)
            {
                connectionFactoryIn.SetStringProperty(XMSC.WMQ_HOST_NAME, MQHostName);
                connectionFactoryIn.SetIntProperty(XMSC.WMQ_PORT, MQPort);
                connectionFactoryIn.SetStringProperty(XMSC.WMQ_CHANNEL, MQChannel);
                LogMessage($"CreateConsumerIn: MQ Location=Remote. MQHostName = {MQHostName} MQPort = {MQPort} MQChannel = {MQChannel} ", Tracing.LogCategory.Debug, Tracing.LogLevel.DebugLow, null);
            }

            connectionFactoryIn.SetIntProperty(XMSC.WMQ_CONNECTION_MODE, XMSC.WMQ_CM_CLIENT);
            connectionFactoryIn.SetStringProperty(XMSC.WMQ_QUEUE_MANAGER, MQManagerName);
            connectionFactoryIn.SetStringProperty(XMSC.WMQ_QUEUE_NAME, MQQueueNameIn);

            // In case of network issues - reconnect to same queue manager
            connectionFactoryIn.SetIntProperty(XMSC.WMQ_CLIENT_RECONNECT_OPTIONS, XMSC.WMQ_CLIENT_RECONNECT_Q_MGR);
            connectionFactoryIn.SetStringProperty(XMSC.WMQ_CONNECTION_NAME_LIST, String.Format("{0}({1})", MQHostName, MQPort));
            connectionFactoryIn.SetIntProperty(XMSC.WMQ_CLIENT_RECONNECT_TIMEOUT, ReconnectInterval);
           
            // Create connection.
            connectionIn = connectionFactoryIn.CreateConnection();
            LogMessage($"CreateConsumerIn: MQ Connection created - {this.Name}", Tracing.LogCategory.Debug, Tracing.LogLevel.DebugMedium, null);
            connectionIn.ExceptionListener = new ExceptionListener(OnExceptionIn);
            // Create session
            sessionIn = connectionIn.CreateSession(false, AcknowledgeMode.ClientAcknowledge);
            LogMessage($"CreateConsumerIn: MQ Session created - {this.Name}", Tracing.LogCategory.Debug, Tracing.LogLevel.DebugMedium, null);

            // Create destination           
            destinationIn = sessionIn.CreateQueue(MQQueueNameIn);
            destinationIn.SetIntProperty(XMSC.WMQ_READ_AHEAD_ALLOWED, XMSC.WMQ_READ_AHEAD_ALLOWED_ENABLED);
            LogMessage($"CreateConsumerIn: MQ Destination created - {this.Name}", Tracing.LogCategory.Debug, Tracing.LogLevel.DebugMedium, null);

            // Create consumer
            messageConsumerIn = sessionIn.CreateConsumer(destinationIn);
            LogMessage($"CreateConsumerIn: MQ Consumer created - {this.Name}", Tracing.LogCategory.Debug, Tracing.LogLevel.DebugMedium, null);

            //Create message listener and assign it to the Message consumer
            messageListenerIn = new MessageListener(OnMessage);
            messageConsumerIn.MessageListener = messageListenerIn;
            connectionIn.Start();