diff --git a/memcheckplugin/memchecker.cpp b/memcheckplugin/memchecker.cpp
--- a/memcheckplugin/memchecker.cpp
+++ b/memcheckplugin/memchecker.cpp
@@ -20,6 +20,7 @@
 --                     Mail : alexis.jeandet@lpp.polytechnique.fr
 ----------------------------------------------------------------------------*/
 #include "memchecker.h"
+#include <socexplorerengine.h>
 
 memchecker::memchecker(socexplorerplugin* plugin)
 {
@@ -83,30 +84,7 @@ unsigned int p_pow2(unsigned int v)
 
 unsigned int memchecker::measureMemSize(unsigned int address, unsigned int maxSize)
 {
-  unsigned int curVal=1,testAddress=address;
-  unsigned int size=0;
-  this->plugin->Write(&curVal,1,testAddress);
-  this->plugin->Read(&curVal,1,testAddress);
-  if(curVal!=1)
-    return size;
-  unsigned int max= p_pow2((0xFFFFFFFFFFFFFFFF - address))+1;
-  register unsigned int maxSizeLg=p_pow2(maxSize)-1;
-  if(max>maxSizeLg)
-    max=maxSizeLg;
-  if(max>32)max=32;
-  for(size=2;size<max;size++) //check each address bit
-    {
-      testAddress = (unsigned int)(address+(1<<size));
-      curVal = (unsigned int)(1<<size);
-      this->plugin->Write(&curVal,1,testAddress);
-      this->plugin->Read(&curVal,1,testAddress);
-      if((unsigned int)curVal!=(unsigned int)(1<<size))
-        return (1<<(size));
-      this->plugin->Read(&curVal,1,address);
-      if((curVal==(unsigned int)(1<<size)) && (size!=0))
-        return (1<<(size));
-    }
-  return (1<<(size+1));
+    return   SocExplorerEngine::memMeasureSize(this->plugin,address,maxSize);
 }
 
 
diff --git a/spwplugin/StarDundee/stardundeespw_usb.cpp b/spwplugin/StarDundee/stardundeespw_usb.cpp
--- a/spwplugin/StarDundee/stardundeespw_usb.cpp
+++ b/spwplugin/StarDundee/stardundeespw_usb.cpp
@@ -406,7 +406,7 @@ stardundeeSPW_USB_Manager::stardundeeSPW
 {
     // TODO remove this crap!
     this->initDialog();
-//    this->moveToThread(this);
+    //    this->moveToThread(this);
 }
 
 stardundeeSPW_USB_Manager::~stardundeeSPW_USB_Manager()
@@ -533,6 +533,8 @@ bool stardundeeSPW_USB_Manager::connectB
 
 bool stardundeeSPW_USB_Manager::connectBridgeAsInterface()
 {
+    if(this->connected)
+        this->disconnectBridge();
     this->handleMutex->lock();
     int status;
     U32 statusControl;
@@ -622,7 +624,8 @@ bool stardundeeSPW_USB_Manager::connectB
 
 bool stardundeeSPW_USB_Manager::connectBridgeAsRouter()
 {
-//    QMutexLocker mlock(&this->handleMutex);
+    if(this->connected)
+        this->disconnectBridge();
     this->handleMutex->lock();
     int status;
     U32 statusControl;
@@ -638,7 +641,7 @@ bool stardundeeSPW_USB_Manager::connectB
         return false;
     }
     SocExplorerEngine::message(this->plugin,"stardundee *** Open *** USBSpaceWire_Open successful, device number: "
-                     + QString::number(this->selectedBrick));
+                               + QString::number(this->selectedBrick));
 
     USBSpaceWire_EnableNetworkMode(hDevice, 0); // deactivate the network mode
     CFGSpaceWire_EnableRMAP(1);                 // Enable the use of RMAP for the StarDundee brick configuration
@@ -904,19 +907,22 @@ unsigned int stardundeeSPW_USB_Manager::
 
 bool stardundeeSPW_USB_Manager::disconnectBridge()
 {
-    this->handleMutex->lock();
-    USBSpaceWire_UnregisterReceiveOnAllPorts(hDevice);  // Stop receiving on all ports
-    USBSpaceWire_Close(hDevice); // Close the device
-    SocExplorerEngine::message(this->plugin,"stardundee *** Close *** USBSpaceWire_Close, device: " + QString::number(0),0);
-    this->handleMutex->unlock();
-    this->RMAP_pending_transaction_IDsMtx->lock();
-    this->RMAP_pending_transaction_IDs.clear();
-    this->RMAP_pending_transaction_IDsMtx->unlock();
-    this->RMAP_AnswersMtx->lock();
-    this->RMAP_Answers.clear();
-    this->RMAP_AnswersMtx->unlock();
-    this->RMAP_AnswersSem->acquire(this->RMAP_AnswersSem->available());
-    this->connected=false;
+    if (this->connected==true)
+    {
+        this->handleMutex->lock();
+        USBSpaceWire_UnregisterReceiveOnAllPorts(hDevice);  // Stop receiving on all ports
+        USBSpaceWire_Close(hDevice); // Close the device
+        SocExplorerEngine::message(this->plugin,"stardundee *** Close *** USBSpaceWire_Close, device: " + QString::number(0),0);
+        this->handleMutex->unlock();
+        this->RMAP_pending_transaction_IDsMtx->lock();
+        this->RMAP_pending_transaction_IDs.clear();
+        this->RMAP_pending_transaction_IDsMtx->unlock();
+        this->RMAP_AnswersMtx->lock();
+        this->RMAP_Answers.clear();
+        this->RMAP_AnswersMtx->unlock();
+        this->RMAP_AnswersSem->acquire(this->RMAP_AnswersSem->available());
+        this->connected=false;
+    }
     return true;
 }
 
@@ -941,7 +947,7 @@ bool stardundeeSPW_USB_Manager::sendPack
         // read the protocole identifier
         protocoleIdentifier = packet[2];
         if (protocoleIdentifier == SPW_PROTO_ID_CCSDS)
-                emit ccsdsPacketTransmittedToSpw();
+            emit ccsdsPacketTransmittedToSpw();
 
         SocExplorerEngine::message(this->plugin,"Packet sent",2);
     }