The Wifi works well in the main room but slows down or stops on the stairs or back terrace. That's when a Setek WiFi extender may help.The Setek's mission is easy: it picks up the signal from your router, boosts it, and sends it to places where your router can't quite reach. But the thing is, if you don't set it up appropriately, you'll again end up with a similar kind of lagging conn... https://www.pearltrees.com/setekwifiextender/item731016458