diff --git a/sample.py b/sample.py
index f5fd9d1..ebc22a7 100644
--- a/sample.py
+++ b/sample.py
@@ -52,12 +52,13 @@ async def main():
                 raise e
 
         # run subscribe_redis on new thread
-        threading.Thread(target=subscribe_redis).start()
+        threading.Thread(target=subscribe_redis, daemon=True).start()
 
         while True:
             await asyncio.gather(*(
                 clients[room_id].join() for room_id in clients
             ))
+            await asyncio.sleep(1)
     finally:
         for room_id in clients:
             await clients[room_id].stop_and_close()
@@ -67,7 +68,10 @@ async def main():
 def flush_files():
     for room_id in log_files:
         log_files[room_id].flush()
-    threading.Timer(1, flush_files).start()
+
+    timer = threading.Timer(1, flush_files)
+    timer.daemon = True
+    timer.start()
 
 
 def subscribe_redis():