If your wireless connection is becoming unreliable, you can simply plug a tiny adapter like this
… into one of your laptop or desktop PC’s USB ports. It will immediately set itself up, ask for your router’s name and password so that it can provide you with a steady connection to your broadband router.
Click here Edimax EW-7811UN 150Mbps Wireless Nano USB Adapter to view one currently on sale on Amazon. They are also widely available in the UK in Argos and Currys amongst other places for about £10