diff --git a/DQM/DTMonitorClient/src/DTBlockedROChannelsTest.cc b/DQM/DTMonitorClient/src/DTBlockedROChannelsTest.cc
index 7f93db1808767..ea8c9801018da 100644
--- a/DQM/DTMonitorClient/src/DTBlockedROChannelsTest.cc
+++ b/DQM/DTMonitorClient/src/DTBlockedROChannelsTest.cc
@@ -154,7 +154,8 @@ void DTBlockedROChannelsTest::dqmEndLuminosityBlock(DQMStore::IBooker& ibooker,
     }
 
     if (!offlineMode) {
-      hSystFractionVsLS = new DTTimeEvolutionHisto(ibooker, "EnabledROChannelsVsLS", "% RO channels", 500, 5, true, 3);
+      hSystFractionVsLS =
+          new DTTimeEvolutionHisto(ibooker, "EnabledROChannelsVsLS", "Fraction of RO channels", 500, 5, true, 3);
     }
   }  // end attempt to make these bookings only once!
 
diff --git a/DQM/DTMonitorClient/src/DTLocalTriggerTest.cc b/DQM/DTMonitorClient/src/DTLocalTriggerTest.cc
index b516fa15dc27f..bdf478dcb6c2f 100644
--- a/DQM/DTMonitorClient/src/DTLocalTriggerTest.cc
+++ b/DQM/DTMonitorClient/src/DTLocalTriggerTest.cc
@@ -149,8 +149,15 @@ void DTLocalTriggerTest::runClientDiagnostic(DQMStore::IBooker& ibooker, DQMStor
                 delete BXHH;
                 delete Flag1st;
 
-                corrFrac = besttrigsCorr / besttrigs;
-                secondFrac = trigsFlag2nd / trigs;
+                if (besttrigs != 0)
+                  corrFrac = besttrigsCorr / besttrigs;
+                else
+                  corrFrac = 1;
+                if (trigs != 0)
+                  secondFrac = trigsFlag2nd / trigs;
+                else
+                  secondFrac = 0;
+
                 if (corrFrac < parameters.getUntrackedParameter<double>("corrFracError", .5)) {
                   corrSummary = 2;
                 } else if (corrFrac < parameters.getUntrackedParameter<double>("corrFracWarning", .6)) {
diff --git a/DQM/DTMonitorModule/interface/DTTimeEvolutionHisto.h b/DQM/DTMonitorModule/interface/DTTimeEvolutionHisto.h
index 53c26f34b3ed5..4e8dc15f8754b 100644
--- a/DQM/DTMonitorModule/interface/DTTimeEvolutionHisto.h
+++ b/DQM/DTMonitorModule/interface/DTTimeEvolutionHisto.h
@@ -73,6 +73,7 @@ class DTTimeEvolutionHisto {
   int nBookedBins;
   int theMode;
   MonitorElement* histo;
+  int binLabelCounter;
 };
 #endif
 
diff --git a/DQM/DTMonitorModule/src/DTTimeEvolutionHisto.cc b/DQM/DTMonitorModule/src/DTTimeEvolutionHisto.cc
index 04ecfc0a9ded7..a198fc78b34eb 100644
--- a/DQM/DTMonitorModule/src/DTTimeEvolutionHisto.cc
+++ b/DQM/DTMonitorModule/src/DTTimeEvolutionHisto.cc
@@ -35,6 +35,7 @@ DTTimeEvolutionHisto::DTTimeEvolutionHisto(DQMStore::IBooker& ibooker,
     : valueLastTimeSlot(0), theFirstLS(firstLS), theLSPrescale(lsPrescale), doSlide(sliding), theMode(mode) {
   // set the number of bins to be booked
   nBookedBins = nbins;
+  binLabelCounter = -1;
   if (sliding)
     nBookedBins++;
   if (!sliding && theMode == 0)
@@ -96,7 +97,8 @@ void DTTimeEvolutionHisto::setTimeSlotValue(float value, int timeSlot) {
       } else if (bin != nBookedBins) {
         histo->setBinContent(bin, histo->getBinContent(bin + 1));
         histo->setBinError(bin, histo->getBinError(bin + 1));
-        histo->setBinLabel(bin, histo->getTH1F()->GetXaxis()->GetBinLabel(bin + 1), 1);
+        histo->setBinLabel(bin, histo->getTH1F()->GetXaxis()->GetBinLabel(bin + 1), 1);  //slide to left
+        histo->setBinLabel(bin + 1, "", 1);  //delete old label to avoid duplication
       }
     }
     histo->setBinContent(nBookedBins, value);
@@ -158,11 +160,15 @@ void DTTimeEvolutionHisto::updateTimeSlot(int ls, int nEventsInLS) {
       // set the bin label
       stringstream binLabel;
       binLabel << "LS " << firstLSinTimeSlot;
-      if (nEventsInLastTimeSlot.size() > 1)
+      if (nEventsInLastTimeSlot.size() > 1) {
         binLabel << "-" << lastLSinTimeSlot;
+        binLabelCounter++;
+      }
 
-      //if(lastLSinTimeSlot%(3*(int)theLSPrescale)==0)
-      histo->setBinLabel(nBookedBins, binLabel.str(), 1);
+      // Set only labels which can be seen in the plot without zooming
+      if (binLabelCounter % ((int)(nBookedBins / 25)) == 0)  //around 25 labels fit in a full size hist
+        histo->setBinLabel(nBookedBins, binLabel.str(), 1);
+      //first label, LS=1 ideally, is guaranteed by setting binLabelCounter=-1 in constructor
 
       // reset the counters for the time slot
       nEventsInLastTimeSlot.clear();