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Very strange problem with my Dell XPS M 1330. I am using Ubuntu 12.10, network hardware is:

09:00.0 Ethernet controller: Broadcom Corporation NetLink BCM5906M Fast Ethernet PCI Express (rev 02)0c:00.0 Network controller: Intel Corporation PRO/Wireless 3945ABG [Golan] Network Connection (rev 02)

iwconfig gives:

wlan0     IEEE 802.11abg  ESSID:"organ"  
      Mode:Managed  Frequency:2.412 GHz  Access Point: 54:E6:FC:C1:E5:32   
      Bit Rate=54 Mb/s   Tx-Power=15 dBm   
      Retry  long limit:7   RTS thr:off   Fragment thr:off
      Power Management:off
      Link Quality=52/70  Signal level=-58 dBm  
      Rx invalid nwid:0  Rx invalid crypt:0  Rx invalid frag:0
      Tx excessive retries:208  Invalid misc:32   Missed beacon:0

lo no wireless extensions. eth0 no wireless extensions.

When I download torrents with Transmission, if the download speed of all active torrents exceeds 2 MB, the computer will shut down. I have no other network issues, everything else works fine. But still, I am paying for much higher download speed and it is frustrating that I cannot get it when downloading stuff.

Do I have to change the network adaptor or it may be a software issue?

Thanks & let me know if need additional information

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So when you limit your download speed to <2MB, everything runs fine? I'm curious, can you test with a different connection such as eth0 or a usb wifi-dongle? Also, what is the output of: df -h –  TenLeftFingers Feb 8 '13 at 13:00
Hi there! You are absolutely right. When I limit the speed, everything is okay. Should I change the torrent client? df -h Filesystem Size Used Avail Use% Mounted on /dev/sda1 220G 147G 62G 71% / udev 2.0G 4.0K 2.0G 1% /dev tmpfs 807M 1.2M 805M 1% /run none 5.0M 0 5.0M 0% /run/lock none 2.0G 84K 2.0G 1% /run/shm none 100M 36K 100M 1% /run/user –  gori4ka Feb 8 '13 at 13:17
Wow, I am sure now it is clearly a transmission issue: changed to Flush and my down speed went up to 45 MB!!! Thanks TenLeftFingers for bringing me on the right track of thought! –  gori4ka Feb 8 '13 at 13:39
Too fast thinking on my side: 45MB was not the down speed, but the down volume. Still, speed is over 2000KB/s and no shutdown yet. –  gori4ka Feb 8 '13 at 13:51
Could you paste the file ~/.config/transmission/settings.json to paste.ubuntu.com or any other paste site (and provide us with the link)? –  qbi Feb 13 '13 at 22:48
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