diff --git a/server/src/intervalcheck.cpp b/server/src/intervalcheck.cpp
--- a/server/src/intervalcheck.cpp
+++ b/server/src/intervalcheck.cpp
@@ -72,7 +72,7 @@
     const int interval = qMax( MINIMUM_COLTREESYNC_INTERVAL, collection.cachePolicyCheckInterval() );
 
     const QDateTime lastExpectedCheck = now.addSecs( interval * -60 );
-    if ( !mLastCollectionTreeSyncs.contains( resourceName ) || mLastCollectionTreeSyncs.value( resourceName ) < lastExpectedCheck ) {
+    if ( !mLastCollectionTreeSyncs.contains( resourceName ) || mLastCollectionTreeSyncs.value( resourceName ) < lastExpectedCheck.addSecs( 2 * -60 ) ) {
       mLastCollectionTreeSyncs.insert( resourceName, now );
       QMetaObject::invokeMethod( ItemRetrievalManager::instance(), "triggerCollectionTreeSync",
                                  Qt::QueuedConnection,
@@ -84,7 +84,9 @@
   const int interval = qMax( MINIMUM_AUTOSYNC_INTERVAL, collection.cachePolicyCheckInterval() );
 
   const QDateTime lastExpectedCheck = now.addSecs( interval * -60 );
-  if ( mLastChecks.contains( collection.id() ) && mLastChecks.value( collection.id() ) > lastExpectedCheck ) {
+  //For an interval of 5min, we don't resync if we already did a sync within the last three minutes.
+  //Doing an exact check is too error prone, and can lead to not syncing for up to 2*interval()-1.
+  if ( mLastChecks.contains( collection.id() ) && mLastChecks.value( collection.id() ) > lastExpectedCheck.addSecs( 2 * -60 ) ) {
     return;
   }
   mLastChecks.insert( collection.id(), now );