Can't connect reach to wifi

Hi @igor.vereninov, sorry for long delayed, I just have a chance to make three reach video for describing the error of wifi connection to a smartphone wifi AP.
This video shows 3 reach, from right side and the middle are good wifi, but the left one can’t connect to AP. You can see the video on this link https://drive.google.com/file/d/0B4NFPYGvPmMvSlVIcWNNdkVCZVk/view?usp=drivesdk