diff --git a/src/main.cpp b/src/main.cpp
index a53f0a31..8266522d 100644
--- a/src/main.cpp
+++ b/src/main.cpp
@@ -5062,7 +5062,7 @@ bool SendMessages(CNode* pto, bool fSendTrickle)
         // Detect stalled peers.
         int nSyncTimeout = GetArg("-synctimeout", 60);
         int64_t tNow = GetTimeMillis();
-        if (pto->tGetblocks) {
+        if (pto->tGetblocks && IsSyncing()) {
             if (pto->tBlockRecving > pto->tBlockRecved) {
                 if (tNow-pto->tBlockRecving > nSyncTimeout * 1000) {
                     LogPrintf("sync peer=%d: Block download stalled for over %d seconds.\n", pto->id, nSyncTimeout);
diff --git a/src/masternode.cpp b/src/masternode.cpp
index 2acf445a..c6e879d5 100644
--- a/src/masternode.cpp
+++ b/src/masternode.cpp
@@ -128,7 +128,7 @@ void ProcessMessageMasternode(CNode* pfrom, std::string& strCommand, CDataStream
         
 
         //search existing masternode list, this is where we update existing masternodes with new dsee broadcasts
-    //LOCK(cs_masternodes);
+    LOCK(cs_masternodes);
         BOOST_FOREACH(CMasterNode& mn, vecMasternodes) {
             if(mn.vin.prevout == vin.prevout) {
                 // count == -1 when it's a new entry
@@ -248,7 +248,7 @@ void ProcessMessageMasternode(CNode* pfrom, std::string& strCommand, CDataStream
         }
 
         // see if we have this masternode
-    //LOCK(cs_masternodes);
+    LOCK(cs_masternodes);
         BOOST_FOREACH(CMasterNode& mn, vecMasternodes) {
             if(mn.vin.prevout == vin.prevout) {
                 // LogPrintf("dseep - Found corresponding mn for vin: %s\n", vin.ToString().c_str());
diff --git a/src/net.cpp b/src/net.cpp
index b7f4170b..6b8c459e 100644
--- a/src/net.cpp
+++ b/src/net.cpp
@@ -875,7 +875,7 @@ void ThreadSocketHandler()
         //
         vector<CNode*> vNodesCopy;
         {
-            //LOCK(cs_vNodes);
+            LOCK(cs_vNodes);
             vNodesCopy = vNodes;
             BOOST_FOREACH(CNode* pnode, vNodesCopy)
                 pnode->AddRef();
@@ -978,7 +978,7 @@ void ThreadSocketHandler()
             BOOST_FOREACH(CNode* pnode, vNodesCopy)
                 pnode->Release();
         }
-    MilliSleep(2); // niceness
+    MilliSleep(1); // niceness
     }
 }
 
@@ -1568,7 +1568,7 @@ void ThreadMessageHandler(int ncore)
         }
 
         // niceness
-        MilliSleep(10);
+        MilliSleep(2);
     }
 }
 
diff --git a/src/net.h b/src/net.h
index 155d7f1d..b6ceca7e 100644
--- a/src/net.h
+++ b/src/net.h
@@ -269,6 +269,7 @@ class CNode
     bool fDarkSendMaster;
     CSemaphoreGrant grantOutbound;
     int nRefCount;
+    CCriticalSection cs_nRefCount;
     NodeId id;
 protected:
 
@@ -417,12 +418,14 @@ class CNode
 
     CNode* AddRef()
     {
+        LOCK(cs_nRefCount);
         nRefCount++;
         return this;
     }
 
     void Release()
     {
+        LOCK(cs_nRefCount);
         nRefCount--;
     }