Region : Egypt

Model : TD-W8961ND

Hardware Version : V3

Firmware Version : 3.0.0 Build 120524 Rel.05221

ISP : TE-Data

I have a problem with the connection between the wireless clients and the router
the problem is that I get a very high ping time and a timeout each 5 or so pings ,
high ping : http://imgur.com/tyFvQT0
ping timeout : http://imgur.com/5u73ldr

every timeout the internet connection stops or drop speed dramatically to 5k of download or so when the ping is on again the speed goes up
the browsing also stops with the timeout and when there is a high ping time I get a very slow download speed and a very slow browsing.
I tried connecting the laptop with a wire to a LAN port the problem seems to disappear
I got an application to see if there is interference on the wireless network channel and I got nothing in major here is a photo of it

http://imgur.com/hrbRzM6

I tried a different laptops and even tried to get a wireless adapter and try it out while disabling the laptop wireless adapter
I am working on Windows 8.1 .