I can reproduce this error too.
The environment is a full CISCO network with vmware ESXi hosts and ubuntu 14.04 
guests.

Also here downloads to about 2MB are going somehow fine, but all which
is taking longer (or more MB to transfer) is dropping to a very low
bandwidth. Very often without any bits transmitted at all.

The issue is, that it looks like if pakets are received in random (not
serial order) the SACK seems to be too aggressive and kicks the high
speed of the transmission

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https://bugs.launchpad.net/bugs/1388786

Title:
  TCP stale transfer with erroneous SACK information

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