diff --git a/brozzler/behaviors.d/facebook.js.template b/brozzler/behaviors.d/facebook.js.template
index fc29e66..543bad7 100644
--- a/brozzler/behaviors.d/facebook.js.template
+++ b/brozzler/behaviors.d/facebook.js.template
@@ -191,6 +191,7 @@ var umbraBehaviorFinished = function() {
         if (umbraState.idleSince != null) {
                 var idleTimeMs = Date.now() - umbraState.idleSince;
                 if (idleTimeMs / 1000 > UMBRA_USER_ACTION_IDLE_TIMEOUT_SEC) {
+                        clearInterval(umbraIntervalId);
                         return true;
                 }
         }
diff --git a/brozzler/behaviors.d/instagram.js b/brozzler/behaviors.d/instagram.js
index 9bc0842..ef4759d 100644
--- a/brozzler/behaviors.d/instagram.js
+++ b/brozzler/behaviors.d/instagram.js
@@ -137,6 +137,7 @@ var umbraInstagramBehavior = {
                 if (this.idleSince != null) {
                         var idleTimeMs = Date.now() - this.idleSince;
                         if (idleTimeMs / 1000 > this.IDLE_TIMEOUT_SEC) {
+                                clearInterval(this.intervalId);
                                 return true;
                         }
                 }
diff --git a/brozzler/behaviors.d/marquette_edu.js b/brozzler/behaviors.d/marquette_edu.js
index b3a70f1..9876a35 100644
--- a/brozzler/behaviors.d/marquette_edu.js
+++ b/brozzler/behaviors.d/marquette_edu.js
@@ -62,6 +62,7 @@ var umbraBehaviorFinished = function() {
     if (umbraState.idleSince != null) {
 	var idleTimeMs = Date.now() - umbraState.idleSince;
 	if (idleTimeMs / 1000 > UMBRA_USER_ACTION_IDLE_TIMEOUT_SEC) {
+            clearInterval(umbraIntervalID);
 	    return true;
 	}
     }
diff --git a/brozzler/behaviors.d/psu24.js b/brozzler/behaviors.d/psu24.js
index a551961..15388fc 100644
--- a/brozzler/behaviors.d/psu24.js
+++ b/brozzler/behaviors.d/psu24.js
@@ -112,6 +112,7 @@ var umbraBehavior = {
 		if (this.idleSince != null) {
 			var idleTimeMs = Date.now() - this.idleSince;
 			if (idleTimeMs / 1000 > this.IDLE_TIMEOUT_SEC) {
+				clearInterval(this.intervalId);
 				return true;
 			}
 		}
diff --git a/brozzler/behaviors.d/simpleclicks.js.template b/brozzler/behaviors.d/simpleclicks.js.template
index 425cecf..282c096 100644
--- a/brozzler/behaviors.d/simpleclicks.js.template
+++ b/brozzler/behaviors.d/simpleclicks.js.template
@@ -110,6 +110,7 @@ var umbraBehavior = {
 		if (this.idleSince != null) {
 			var idleTimeMs = Date.now() - this.idleSince;
 			if (idleTimeMs / 1000 > this.IDLE_TIMEOUT_SEC) {
+				clearInterval(this.intervalId);
 				return true;
 			}
 		}