diff --git a/zuul/driver/__init__.py b/zuul/driver/__init__.py
index 1cc5235..57b5cf9 100644
--- a/zuul/driver/__init__.py
+++ b/zuul/driver/__init__.py
@@ -68,6 +68,17 @@
         """
         pass
 
+    def stop(self):
+        """Stop the driver from running.
+
+        This method is optional; the base implementation does nothing.
+
+        This method is called when the connection registry is stopped
+        allowing you additionally stop any running Driver computation
+        not specific to a connection.
+        """
+        pass
+
 
 @six.add_metaclass(abc.ABCMeta)
 class ConnectionInterface(object):
diff --git a/zuul/driver/timer/__init__.py b/zuul/driver/timer/__init__.py
index 00ddb26..115e6af 100644
--- a/zuul/driver/timer/__init__.py
+++ b/zuul/driver/timer/__init__.py
@@ -38,6 +38,10 @@
 
     def reconfigure(self, tenant):
         self._removeJobs(tenant)
+        if not self.apsched:
+            # Handle possible reuse of the driver without connection objects.
+            self.apsched = BackgroundScheduler()
+            self.apsched.start()
         self._addJobs(tenant)
 
     def _removeJobs(self, tenant):
@@ -87,7 +91,9 @@
             self.sched.addEvent(event)
 
     def stop(self):
-        self.apsched.shutdown()
+        if self.apsched:
+            self.apsched.shutdown()
+            self.apsched = None
 
     def getTrigger(self, connection_name, config=None):
         return timertrigger.TimerTrigger(self, config)
diff --git a/zuul/lib/connections.py b/zuul/lib/connections.py
index 262c7cb..03cba2a 100644
--- a/zuul/lib/connections.py
+++ b/zuul/lib/connections.py
@@ -67,6 +67,8 @@
     def stop(self):
         for connection_name, connection in self.connections.items():
             connection.onStop()
+        for driver in self.drivers.values():
+            driver.stop()
 
     def configure(self, config):
         # Register connections from the config