diff --git a/Common/Hardware/Interfaces/Ports/SerialPorts/BaseSerialPort.cs b/Common/Hardware/Interfaces/Ports/SerialPorts/BaseSerialPort.cs
index 13ae7987..9db4a064 100644
--- a/Common/Hardware/Interfaces/Ports/SerialPorts/BaseSerialPort.cs
+++ b/Common/Hardware/Interfaces/Ports/SerialPorts/BaseSerialPort.cs
@@ -419,6 +419,9 @@ namespace Xylem.Common.Hardware.Interfaces.Ports.SerialPorts
         ///   The IrDA sniffer showed these on the communication line, but they are incompletely received.
         ///   Assuming the DiscardInBuffer may be delayed, so the incoming data will be scrapped.
         /// </remarks>
+        /// <remarks date="2025-Mai-12" author="T.Wiedebusch">
+        /// - Dispose procedure changed.
+        /// </remarks>
         private void ReadingThreadLoop()
         {
             //put the receive thread to JoinWaitSleep to avoid reading and logger output for timeout on 
@@ -608,20 +611,23 @@ namespace Xylem.Common.Hardware.Interfaces.Ports.SerialPorts
             }
             finally
             {
-                if (_serialPort.IsOpen)
-                {
-                    _serialPort.Close();
-                    if (_serialPort.IsOpen)
-                    {
-                        _byteDataLogger.Info($"{Ident} Port close delay!");
-                        Thread.Sleep(50);
-                        _serialPort.Close();
-                    }
-                    _serialPort.Dispose();
-                    _byteDataLogger.Info($"{Ident} Port is closed");
+                //if (_serialPort.IsOpen)
+                //{
+                //    _serialPort.Close();
+                //    if (_serialPort.IsOpen)
+                //    {
+                //        _byteDataLogger.Info($"{Ident} Port closing delay!");
+                //        Thread.Sleep(500);
+                //        _serialPort.Close();
+                //    }
+                //    //_serialPort.Dispose();
+                //    //_byteDataLogger.Info($"{Ident} Port is closed");
+                //}
+                _serialPort.DiscardInBuffer();
+                _serialPort.DiscardOutBuffer();
+                _serialPort.Close();
 
-
-                }
+                _byteDataLogger.Info($"{Ident} Port is closed");
             }
         }
 
diff --git a/Common/Production/ProductionUiCordonel/Docu/TBF_COM_EOL_SDDe.docx b/Common/Production/ProductionUiCordonel/Docu/TBF_COM_EOL_SDDe.docx
deleted file mode 100644
index 969eff1a..00000000
Binary files a/Common/Production/ProductionUiCordonel/Docu/TBF_COM_EOL_SDDe.docx and /dev/null differ
diff --git a/Common/Production/ProductionUiCordonel/Docu/TBF_COM_EOL_SRSe.docx b/Common/Production/ProductionUiCordonel/Docu/TBF_COM_EOL_SRSe.docx
index 68e79a87..76f21119 100644
Binary files a/Common/Production/ProductionUiCordonel/Docu/TBF_COM_EOL_SRSe.docx and b/Common/Production/ProductionUiCordonel/Docu/TBF_COM_EOL_SRSe.docx differ
diff --git a/Common/Production/ProductionUiCordonel/ProductionProcesses/FinalProcessController.cs b/Common/Production/ProductionUiCordonel/ProductionProcesses/FinalProcessController.cs
index 408c53a3..21092831 100644
--- a/Common/Production/ProductionUiCordonel/ProductionProcesses/FinalProcessController.cs
+++ b/Common/Production/ProductionUiCordonel/ProductionProcesses/FinalProcessController.cs
@@ -588,11 +588,14 @@ namespace Xylem.Common.Production.ProductionUiCordonel.ProductionProcesses
         /// <remarks date="2024-Jul-15" author="Thomas Wiedebusch">
         /// - Handle genesis meter is null as new meter.
         /// </remarks>
+        /// <remarks date="2025-Mai-12" author="Thomas Wiedebusch">
+        /// - Check _genesisMeter not null before equality with old pcbid.
+        /// </remarks>
         private Boolean CheckForNewMeter()
         {
             if (_genesisMeter == null ||
                 (!string.IsNullOrEmpty(_lastPcbId) &&
-                !_genesisMeter.PcbId.Equals(_lastPcbId)))
+                _genesisMeter != null && !_genesisMeter.PcbId.Equals(_lastPcbId)))
             {
                 // This loop will be entered after the meter has changed, but not on the initial meter
                 // after program start.