diff --git a/api/ovkiosk/dav_file.py b/api/ovkiosk/dav_file.py
index a279bc8..0d909ff 100644
--- a/api/ovkiosk/dav_file.py
+++ b/api/ovkiosk/dav_file.py
@@ -11,6 +11,8 @@ _logger = logging.getLogger(__name__)
 
 class DavFile:
     __instances = None
+    __scheduler = None
+    __job = None
 
     def __init__(self, client: Client, path: Any) -> None:
         self.__resource: Resource = client.resource(path)
@@ -31,21 +33,29 @@ class DavFile:
             self.__resource.write_to(self.__buffer)
 
     @classmethod
-    def refresh(cls, refresh_interval: int = 5) -> AsyncIOScheduler:
-        scheduler = AsyncIOScheduler()
+    def refresh(cls, refresh_interval: int = 60):
+        if cls.__job is not None:
+            cls.__scheduler.reschedule_job(
+                job_id=cls.__name__,
+                trigger="interval",
+                seconds=refresh_interval,
+            )
+            return
 
         def tick() -> None:
             for davfile in DavFile.__instances:
                 davfile.update()
 
-        scheduler.add_job(tick)
-        scheduler.add_job(
-            tick, "interval",
+        cls.__scheduler = AsyncIOScheduler()
+        cls.__scheduler.start()
+
+        cls.__scheduler.add_job(tick)
+        cls.__job = cls.__scheduler.add_job(
+            tick,
+            id=cls.__name__,
+            trigger="interval",
             seconds=refresh_interval,
         )
-        scheduler.start()
-
-        return scheduler
 
     @property
     def bytes(self) -> bytes: