diff --git a/DCCWaveform.cpp b/DCCWaveform.cpp
index eb25144..7471fb5 100644
--- a/DCCWaveform.cpp
+++ b/DCCWaveform.cpp
@@ -145,7 +145,7 @@ void DCCWaveform::interrupt2() {
     // As we get to the end of the preambles, open the reminder window.
     // This delays any reminder insertion until the last moment so
     // that the reminder doesn't block a more urgent packet. 
-    reminderWindowOpen=transmitRepeats==0 && remainingPreambles<4 && remainingPreambles>1;
+    reminderWindowOpen=transmitRepeats==0 && remainingPreambles<12 && remainingPreambles>1;
     if (remainingPreambles==1) promotePendingPacket();
     else if (remainingPreambles==10 && isMainTrack && railcomActive) DCCTimer::ackRailcomTimer();
     // Update free memory diagnostic as we don't have anything else to do this time.
diff --git a/version.h b/version.h
index 131d09a..977febc 100644
--- a/version.h
+++ b/version.h
@@ -3,7 +3,8 @@
 
 #include "StringFormatter.h"
 
-#define VERSION "5.4.9"
+#define VERSION "5.4.10"
+// 5.4.10 - Bugfix: MEGA DCC waveform starvation (sends too many idles)
 // 5.4.9  - Handle non-compliant decoders returning 255 for cv 20 and confusing <R> with bad consist addresses.
 //        - <W CONSIST longaddr> handles non-compliant decoders which NAK cv 20 writes.
 // 5.4.8  - Bugfix: Insert idle packet at end of speed reminder loop; treat all function groups equal