diff --git a/admin/registration/lib.php b/admin/registration/lib.php
index 6aed4376f30..5a521e18fc9 100644
--- a/admin/registration/lib.php
+++ b/admin/registration/lib.php
@@ -53,32 +53,30 @@ class registration_manager {
     public function cron() {
         global $CFG;
         if (extension_loaded('xmlrpc')) {
-            //check if the last registration cron update was less than a week ago
-            $lastcron = get_config('registration', 'crontime');
-            if ($lastcron === false or $lastcron < strtotime("-7 day")) { //set to a week, see MDL-23704
-                $function = 'hub_update_site_info';
-                require_once($CFG->dirroot . "/webservice/xmlrpc/lib.php");
+            $function = 'hub_update_site_info';
+            require_once($CFG->dirroot . "/webservice/xmlrpc/lib.php");
 
-                //update all hub where the site is registered on
-                $hubs = $this->get_registered_on_hubs();
-                foreach ($hubs as $hub) {
-                    //update the registration
-                    $siteinfo = $this->get_site_info($hub->huburl);
-                    $params = array('siteinfo' => $siteinfo);
-                    $serverurl = $hub->huburl . "/local/hub/webservice/webservices.php";
-                    $xmlrpcclient = new webservice_xmlrpc_client($serverurl, $hub->token);
-                    try {
-                        $result = $xmlrpcclient->call($function, $params);
-                        $this->update_registeredhub($hub); // To update timemodified.
-                        mtrace(get_string('siteupdatedcron', 'hub', $hub->hubname));
-                    } catch (Exception $e) {
-                        $errorparam = new stdClass();
-                        $errorparam->errormessage = $e->getMessage();
-                        $errorparam->hubname = $hub->hubname;
-                        mtrace(get_string('errorcron', 'hub', $errorparam));
-                    }
+            // Update all hubs where the site is registered.
+            $hubs = $this->get_registered_on_hubs();
+            if (empty($hubs)) {
+                mtrace(get_string('registrationwarning', 'admin'));
+            }
+            foreach ($hubs as $hub) {
+                // Update the registration.
+                $siteinfo = $this->get_site_info($hub->huburl);
+                $params = array('siteinfo' => $siteinfo);
+                $serverurl = $hub->huburl . "/local/hub/webservice/webservices.php";
+                $xmlrpcclient = new webservice_xmlrpc_client($serverurl, $hub->token);
+                try {
+                    $result = $xmlrpcclient->call($function, $params);
+                    $this->update_registeredhub($hub); // To update timemodified.
+                    mtrace(get_string('siteupdatedcron', 'hub', $hub->hubname));
+                } catch (Exception $e) {
+                    $errorparam = new stdClass();
+                    $errorparam->errormessage = $e->getMessage();
+                    $errorparam->hubname = $hub->hubname;
+                    mtrace(get_string('errorcron', 'hub', $errorparam));
                 }
-                set_config('crontime', time(), 'registration');
             }
         } else {
             mtrace(get_string('errorcronnoxmlrpc', 'hub'));
diff --git a/lib/classes/task/scheduled_task.php b/lib/classes/task/scheduled_task.php
index 9c525e5860d..aedfcebe5ac 100644
--- a/lib/classes/task/scheduled_task.php
+++ b/lib/classes/task/scheduled_task.php
@@ -35,11 +35,17 @@ abstract class scheduled_task extends task_base {
     const MINUTEMIN = 0;
     /** Maximum minute value. */
     const MINUTEMAX = 59;
+
     /** Minimum hour value. */
     const HOURMIN = 0;
     /** Maximum hour value. */
     const HOURMAX = 23;
 
+    /** Minimum dayofweek value. */
+    const DAYOFWEEKMIN = 0;
+    /** Maximum dayofweek value. */
+    const DAYOFWEEKMAX = 6;
+
     /** @var string $hour - Pattern to work out the valid hours */
     private $hour = '*';
 
@@ -173,6 +179,9 @@ abstract class scheduled_task extends task_base {
      * @param string $dayofweek
      */
     public function set_day_of_week($dayofweek) {
+        if ($dayofweek === 'R') {
+            $dayofweek = mt_rand(self::DAYOFWEEKMIN, self::DAYOFWEEKMAX);
+        }
         $this->dayofweek = $dayofweek;
     }
 
diff --git a/lib/db/tasks.php b/lib/db/tasks.php
index 8dc4f4e1cf0..6c4d7d203da 100644
--- a/lib/db/tasks.php
+++ b/lib/db/tasks.php
@@ -215,10 +215,10 @@ $tasks = array(
     array(
         'classname' => 'core\task\registration_cron_task',
         'blocking' => 0,
-        'minute' => '0',
-        'hour' => '3',
+        'minute' => 'R',
+        'hour' => 'R',
         'day' => '*',
-        'dayofweek' => '*',
+        'dayofweek' => 'R',
         'month' => '*'
     ),
     array(
diff --git a/lib/tests/scheduled_task_test.php b/lib/tests/scheduled_task_test.php
index 2d5e2058860..95a5a0dc3a6 100644
--- a/lib/tests/scheduled_task_test.php
+++ b/lib/tests/scheduled_task_test.php
@@ -329,6 +329,7 @@ class core_scheduled_task_testcase extends advanced_testcase {
         // Set a random value.
         $testclass->set_minute('R');
         $testclass->set_hour('R');
+        $testclass->set_day_of_week('R');
 
         // Verify the minute has changed within allowed bounds.
         $minute = $testclass->get_minute();
@@ -341,6 +342,12 @@ class core_scheduled_task_testcase extends advanced_testcase {
         $this->assertInternalType('int', $hour);
         $this->assertGreaterThanOrEqual(0, $hour);
         $this->assertLessThanOrEqual(23, $hour);
+
+        // Verify the dayofweek has changed within allowed bounds.
+        $dayofweek = $testclass->get_day_of_week();
+        $this->assertInternalType('int', $dayofweek);
+        $this->assertGreaterThanOrEqual(0, $dayofweek);
+        $this->assertLessThanOrEqual(6, $dayofweek);
     }
 
     /**