Try not getting the same data over and over again...

kumisensors.py

@@ -13,15 +13,10 @@ class KumiSensors:
         if not "://" in host:
             host = "http://" + host
         self.host = host
-        self.data = None
         self.hass = hass
 
-    def fetch_data(self):
-        return json.load(urlopen(self.host))
-
     async def get_data(self) -> dict:
-        self.data = self.data or await self.hass.async_add_executor_job(self.fetch_data)
-        return self.data        
+        return await self.hass.async_add_executor_job(json.load(urlopen(self.host)))
 
     async def connect(self) -> bool:
         """Test if we can connect to the host."""