networking - Large downloads at full speed freeze on wired connection - Ask Ubuntu

i'm using ubuntu 14.04 lts. i'm having problems downloading large files, example of ones located here: http://www.thinkbroadband.com/download.html , through either firefox, wget or other program. after few random seconds (but more 20) download freezes(*). happens when downloading @ full speed (on 6 mbps connection), and happens on ethernet, not on wifi.

another pc ubuntu goes through same router (also wired) has no issues.

this wasn't this. started happening year ago.

(*): wget shows download speed "--.-k/s", , 15 minutes later aborts:

--2016-10-27 13:41:02--  http://download.thinkbroadband.com/1gb.zip resolving download.thinkbroadband.com (download.thinkbroadband.com)... 80.249.106.10, 2a02:68:1:8::2 connecting download.thinkbroadband.com (download.thinkbroadband.com)|80.249.106.10|:80... connected. http request sent, awaiting response... 200 ok length: 1073741824 (1,0g) [application/zip] saving to: ‘1gb.zip.3’   1% [>                                                                                        ] 20.261.610  --.-k/s   in 15m 27s   2016-10-27 13:56:30 (21,3 kb/s) - read error @ byte 20261610/1073741824 (connection timed out). retrying. 

lshw -class network

  *-network disabled              description: wireless interface        product: ar9485 wireless network adapter        vendor: qualcomm atheros        physical id: 0        bus info: pci@0000:03:00.0        logical name: wlan0        version: 01        serial: f8:1a:67:87:13:9b        width: 64 bits        clock: 33mhz        capabilities: pm msi pciexpress bus_master cap_list rom ethernet physical wireless        configuration: broadcast=yes driver=ath9k driverversion=3.13.0-98-generic firmware=n/a latency=0 link=no multicast=yes wireless=ieee 802.11bgn        resources: irq:16 memory:f7d00000-f7d7ffff memory:f7d80000-f7d8ffff   *-network        description: ethernet interface        product: rtl8111/8168/8411 pci express gigabit ethernet controller        vendor: realtek semiconductor co., ltd.        physical id: 0        bus info: pci@0000:04:00.0        logical name: eth0        version: 09        serial: 30:85:a9:97:99:87        size: 100mbit/s        capacity: 1gbit/s        width: 64 bits        clock: 33mhz        capabilities: pm msi pciexpress msix vpd bus_master cap_list ethernet physical tp mii 10bt 10bt-fd 100bt 100bt-fd 1000bt 1000bt-fd autonegotiation        configuration: autonegotiation=on broadcast=yes driver=r8169 driverversion=2.3lk-napi duplex=full firmware=rtl8168f-1_0.0.5 06/18/12 ip=192.168.1.201 latency=0 link=yes multicast=yes port=mii speed=100mbit/s        resources: irq:41 ioport:d000(size=256) memory:f0004000-f0004fff memory:f0000000-f0003fff 

ifconfig eth0

eth0      link encap:ethernet  hwaddr 30:85:a9:97:99:87             inet addr:192.168.1.201  bcast:192.168.1.255  mask:255.255.255.0           inet6 addr: fe80::3285:a9ff:fe97:9987/64 scope:link           broadcast running multicast  mtu:1500  metric:1           rx packets:556155 errors:0 dropped:0 overruns:0 frame:0           tx packets:433915 errors:0 dropped:0 overruns:0 carrier:0           collisions:0 txqueuelen:1000            rx bytes:627229091 (627.2 mb)  tx bytes:121589957 (121.5 mb) 

nm-tool

networkmanager tool  state: connected (global)  - device: eth0  [wired connection 1] -------------------------------------------   type:              wired   driver:            r8169   state:             connected   default:           yes   hw address:        30:85:a9:97:99:87    capabilities:     carrier detect:  yes     speed:           100 mb/s    wired properties     carrier:         on    ipv4 settings:     address:         192.168.1.201     prefix:          24 (255.255.255.0)     gateway:         192.168.1.1      dns:             8.8.4.4     dns:             8.8.8.8     dns:             200.42.4.210     dns:             200.49.130.44   - device: wlan0 ----------------------------------------------------------------   type:              802.11 wifi   driver:            ath9k   state:             unavailable   default:           no   hw address:        f8:1a:67:87:13:9b    capabilities:    wireless properties     wep encryption:  yes     wpa encryption:  yes     wpa2 encryption: yes    wireless access points