diff --git a/RELEASENOTES.md b/RELEASENOTES.md
index 3d6f16349c..fcf2c5fc46 100644
--- a/RELEASENOTES.md
+++ b/RELEASENOTES.md
@@ -34,6 +34,9 @@
 *   DASH:
     *   Fix handling of empty segment timelines
         ([#11014](https://github.com/google/ExoPlayer/issues/11014)).
+*   IMA DAI extension:
+    *   Fix a bug where a new ad group is inserted in live streams because the
+        calculated content position in consecutive timelines varies slightly.
 *   Remove deprecated symbols:
     *   Remove `DefaultAudioSink` constructors, use `DefaultAudioSink.Builder`
         instead.
diff --git a/libraries/exoplayer_ima/src/main/java/androidx/media3/exoplayer/ima/ImaServerSideAdInsertionMediaSource.java b/libraries/exoplayer_ima/src/main/java/androidx/media3/exoplayer/ima/ImaServerSideAdInsertionMediaSource.java
index 13d3209098..d418768885 100644
--- a/libraries/exoplayer_ima/src/main/java/androidx/media3/exoplayer/ima/ImaServerSideAdInsertionMediaSource.java
+++ b/libraries/exoplayer_ima/src/main/java/androidx/media3/exoplayer/ima/ImaServerSideAdInsertionMediaSource.java
@@ -1340,16 +1340,18 @@ public final class ImaServerSideAdInsertionMediaSource extends CompositeMediaSou
       }
       AdPlaybackState newAdPlaybackState = adPlaybackState;
       Timeline timeline = player.getCurrentTimeline();
+      Timeline.Period currentPeriod = new Timeline.Period();
       long positionInWindowUs =
-          timeline.getPeriod(player.getCurrentPeriodIndex(), new Timeline.Period())
-              .positionInWindowUs;
-      long currentContentPeriodPositionUs =
-          msToUs(player.getContentPosition()) - positionInWindowUs;
+          timeline.getPeriod(player.getCurrentPeriodIndex(), currentPeriod).positionInWindowUs;
+      long contentPositionUs =
+          player.isPlayingAd()
+              ? currentPeriod.getAdGroupTimeUs(player.getCurrentAdGroupIndex())
+              : msToUs(player.getContentPosition());
       Ad ad = event.getAd();
       AdPodInfo adPodInfo = ad.getAdPodInfo();
       newAdPlaybackState =
           addLiveAdBreak(
-              currentContentPeriodPositionUs,
+              /* currentContentPeriodPositionUs= */ contentPositionUs - positionInWindowUs,
               /* adDurationUs= */ secToUsRounded(ad.getDuration()),
               /* adPositionInAdPod= */ adPodInfo.getAdPosition(),
               /* totalAdDurationUs= */ secToUsRounded(adPodInfo.getMaxDuration()),