E2000 packet loss (cabled)

A little back story first.
A while ago I bought a WRT320N as a trade-in offer, unfortunately I had around 20% packet loss on my connection after I set it up. If running directly through my cable modem I had no connection issues at all.
I was running the whole setup cabled, and have no peripherals using the wireless connection.
The router was returned to the retailer for RMA, and in the end I got the purchase credited.
My setup
ISP: Dansk Kabel TV (danish provider for internet, TV etc.)
Modem: Netgear CVD31T  DOCSIS 3.0 compliant Cablemodem (I do not have access to the modem, as it is provided by the ISP.
I have now bought an E2000, and set it up in the same manner as the previous router.
This has returned the same problems I had with my previous router.
Updating the firmware didn't make any difference.
Using Pingtest.net as my test reference I get results like this.
when connected directly to the modem I get 0% packet loss, max 20ms ping and jitter is 2-3ms.
Have I been so unlucky to get 2 faulty routers in  a row, or could there be some problems with Linksys routers and Netgear?
I have unsuccessfully tried switching cables without any change, tried moving the router "far" away from the modem, monitors etc to see if there could be any interference from the wireless.
I am really at a loss here - am i looking at yet another return to the retailer - or is there some obscure solution out there ?

Open the setup page of the router and change the MTU size to 1365. Power cycle the router and see if that makes any difference.
open the command prompt on your windows computer and type ping yahoo.com and hit enter on your keyboard. Observe the connection.
You have already upgraded the firmware on your router. After upgrading the firmware on your router, it is recommended that you should reset the router and reconfigure it. Press and hold the reset button on your router for 30 seconds. Release the reset button and wait for 30 seconds. Power cycle the router and reconfigure it.

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    Edit: Also, here is a Netalzyr test if that shows anything!
    http://n2.netalyzr.icsi.berkeley.edu/restore/id=43ca208a-9404-ae6b5d67-4e6f-4678-9c9f/rd#

    I did a quiet line test earlier, with a cordless phone. There was a humming which i think was just normal, but about 30 seconds in there was a crackle which lasted about half a second. I kept it on for about 2 minutes before turning it off.
    ADSL Line Status
    Connection Information
    Line state:
    Connected
    Connection time:
    0 days, 01:03:32
    Downstream:
    12.05 Mbps
    Upstream:
    1.047 Mbps
    ADSL Settings
    VPI/VCI:
    0/38
    Type:
    PPPoA
    Modulation:
    G.992.5 Annex A
    Latency type:
    Fast
    Noise margin (Down/Up):
    3.9 dB / 6.4 dB
    Line attenuation (Down/Up):
    33.0 dB / 19.0 dB
    Output power (Down/Up):
    20.4 dBm / 12.8 dBm
    FEC Events (Down/Up):
    0 / 51170
    CRC Events (Down/Up):
    10528 / 63798
    Loss of Framing (Local/Remote):
    0 / 0
    Loss of Signal (Local/Remote):
    0 / 0
    Loss of Power (Local/Remote):
    0 / 0
    HEC Events (Down/Up):
    2113 / 399492
    Error Seconds (Local/Remote):
    2781 / 8577
    Also here is another one of the ADSL stats at 1 hour connection time.

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