i know now what causing my problem it was the smartphone Samsung j5 always uploading when connected to my tp link now how can control the bandwidth of a specific device like samsung or stoping it...

well i stll have the problem after upgrading to last framware

thanks but this framware is not of my regeion im from morocco

Hardware Version : TD-W8968 V4 0x00000001 Firmware Version : 1.0.5 Build 150504 Rel.57027

Model : Hardware Version : Firmware Version : ISP : I have a problem with tp link td w8968 only when i activat the wireless Randomly the internet goes off entill i make any change on wireless setting...