Okay, nerds, here's a weird one. My WiFi works poorly in my kitchen. With line of sight to the access point, maybe 5 meters away. It works fine at the coffee table in the next room which also has line of sight to the same access point. I use 5GHz only. It is not the microwave oven. The only thing I can think of is maybe lighting, but in the 5GHz band? This affects several different WiFi adapters and computers.