Comment by aequitas

Wifi is weird sometimes. I once had to help my nephew with his network. He had 2 adjacent rooms, but with half a meter concrete inbetween. Needless to say the signal would not penetrate from one room to the other, no matter how close we moved the router and laptop to each other in their respective rooms. But moving the router and laptop back would make it work all of a sudden. Turned out, moving them back would position them in front of the windows, and the signal would then go out of the window and bounce of the neighbouring building to the other room's window.