diff --git a/fhem/FHEM/00_ZWDongle.pm b/fhem/FHEM/00_ZWDongle.pm
index 93df34daa..c255dae25 100755
--- a/fhem/FHEM/00_ZWDongle.pm
+++ b/fhem/FHEM/00_ZWDongle.pm
@@ -410,9 +410,10 @@ ZWave_HandleSendStack($)
 {
   my $hash = shift;
   shift @{$hash->{SendStack}};
+  RemoveInternalTimer($hash);   # remove timer to avoid re-trigger
   return if(!@{$hash->{SendStack}});
   ZWDongle_Write($hash, "00", $hash->{SendStack}->[0], 1);
-  InternalTimer(gettimeofday()+0.1, "ZWave_HandleSendStack", $hash, 0);
+  InternalTimer(gettimeofday()+0.5, "ZWave_HandleSendStack", $hash, 0);
 }
 
 #####################################
@@ -509,7 +510,6 @@ ZWDongle_ReadAnswer($$$)
         if(!$hash || ($^O !~ /Win/ && !defined($hash->{FD})));
   my $to = ($hash->{RA_Timeout} ? $hash->{RA_Timeout} : 3);
 
-  shift @{$hash->{SendStack}};   # Hope this is right.
   for(;;) {
 
     my $buf;
diff --git a/fhem/FHEM/10_ZWave.pm b/fhem/FHEM/10_ZWave.pm
index 78c26e048..c49be7141 100755
--- a/fhem/FHEM/10_ZWave.pm
+++ b/fhem/FHEM/10_ZWave.pm
@@ -619,7 +619,11 @@ ZWave_Parse($$@)
     return $ret;
 
   } elsif($cmd eq "ZW_SEND_DATA") {
-    Log3 $ioName, 2, "$ioName ERROR: SEND_DATA returned $id" if($id ne "00");
+    if($id ne "00") {
+      Log3 $ioName, 2, "$ioName ERROR: SEND_DATA returned $id";
+    } else {
+      ZWave_HandleSendStack($iodev);
+    }
     return "";
   }