HELP! Wifi has poor connection

I bought a new wifi router TP Link TL-WR842ND

I changed my previous router as the wifi connection was intermitted and i thought that it is malfunctioning.



so I setup it as this:



Mode: 11bgn mixed

Channel Width: 40MHz

Channel: Auto

Max Tx Rate: 300Mbps



initially it was great.

but somehow the wifi connection stopped to a crawl or a total standstill.

I tried changing the channel but still no use.

The wired connection works great.



I am totally lost why this happen.

I tried changing the channel and move my laptop beside the router and the connection still is very bad.

what is wrong with it?



BUT VERY strangely, my nexus 4 can connect to the same wifi and surf the internet perfectly.

while my laptop struggle with a simple google search page loading.





while on wifi with laptop....

Code:

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ping -t 192.168.1.1



Pinging 192.168.1.1 with 32 bytes of data:

Request timed out.

Request timed out.

Reply from 192.168.1.1: bytes=32 time=1387ms TTL=64

Reply from 192.168.1.1: bytes=32 time=83ms TTL=64

Reply from 192.168.1.1: bytes=32 time=3498ms TTL=64

Request timed out.

Reply from 192.168.1.1: bytes=32 time=1522ms TTL=64

Reply from 192.168.1.1: bytes=32 time=16ms TTL=64

Request timed out.

Reply from 192.168.1.1: bytes=32 time=2390ms TTL=64

Reply from 192.168.1.1: bytes=32 time=29ms TTL=64

Reply from 192.168.1.1: bytes=32 time=1112ms TTL=64

Reply from 192.168.1.1: bytes=32 time=13ms TTL=64

Request timed out.

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