I have very strange behaviour with Wi-Fi at my Ubuntu 15.04 at laptop Lenovo Ideapad Y570. I have perfect internet connection if connect cable to my Ethernet directly. But with Wi-Fi if I download something (even web page) internet speed become very slow. Not only internet, even local resources like router configuration page. The normal ping near 30ms. If I opening web-page it is 500-900ms. If I download something big it can be 16000-20000ms and even more. Looks like that it connected to download time: when you download something ping increasing with each next packet - longer downloading process = bigger ping in result. My girlfriend doesn't see this problem at her Windows 7 laptop. I also don't see this problem at my Ubuntu Phone.
Disconnecting from Wi-Fi and connecting again solves problem for few seconds. What can be wrong?
My lshw:
*-network
description: Wireless interface
product: Centrino Wireless-N 1000 [Condor Peak]
vendor: Intel Corporation
physical id: 0
bus info: pci@0000:08:00.0
logical name: wlan0
version: 00
serial: 74:e5:0b:ee:f5:94
width: 64 bits
clock: 33MHz
capabilities: pm msi pciexpress bus_master cap_list ethernet physical wireless
configuration: broadcast=yes driver=iwlwifi driverversion=3.19.0-28-generic firmware=39.31.5.1 build 35138 ip=192.168.1.108 latency=0 link=yes multicast=yes wireless=IEEE 802.11bgn
resources: irq:33 memory:f1b00000-f1b01fff
Router is TP-Link TL-WR740N/ND v4 with firmware: OpenWrt Barrier Breaker 14.07 / LuCI Trunk (0.12+svn-r10530)
Ubuntu and kernel version:
robotex@robotex-laptop:~$ uname -a
Linux robotex-laptop 3.19.0-28-generic #30-Ubuntu SMP Mon Aug 31 15:52:51 UTC 2015 x86_64 x86_64 x86_64 GNU/Linux
robotex@robotex-laptop:~$ lsb_release -a
No LSB modules are available.
Distributor ID: Ubuntu
Description: Ubuntu 15.04
Release: 15.04
Codename: vivid