Click “ Change advanced power settings“.This will help in positioning the WiFi adapter in a better position. You may need to do some settings in the WiFi router to get better stability.
Check the WiFi router manual for the correct orientation of the Wifi router antenna. Keep the Wifi Router away from obstructions.Try orienting it to each of four directions and see which one works best for you. The orientation of the WiFi adapter makes a lot of difference.Keep the WiFi adapter away from obstructions such as walls, metal objects, and other electrical equipment.Try not to keep your computer far away from the WiFi router. To get better signal strength and speed you need to keep the WiFi adapter near the WiFi router.
I will focus only on WiFi adapter which supports IEEE 802.11ac & IEEE 802.11n.