When we use the wireless network, holding the phone to move in different parts of the room, we will find that the network will also change, sometimes suddenly very slow, and even no signal.
This shows that our location is just a signal blind spot or dead Angle, should be adjusted in time to place the wireless router, so that its signal can cover all areas of the room.
If the room area is particularly large, you can also install a gain antenna for the wireless router, which can greatly increase the signal coverage of the wireless router.