Have you tried with a 3.12 or newer kernel?
I had a USB 3 caddy which was consistent in disconnecting but seems to have
been fixed by this new kernel.
I also blacklist the rts5139 (writing on phone may have module name wrong)
module which is for the card reader.
 On 27/11/2013 4:15 AM, "Dmitry Pankratov" <1050...@bugs.launchpad.net>
wrote:

> I have updated BIOS to P15 and that didn't make any difference. Device
> still disconnects randomly and is practically unusable in xHCI mode.
> dmidecode command results:
> F15
> 09/16/2010
>
> --
> You received this bug notification because you are subscribed to the bug
> report.
> https://bugs.launchpad.net/bugs/1050352
>
> Title:
>   External USB 3.0 hard drive randomly disconnects and connects
>
> To manage notifications about this bug go to:
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Title:
  External USB 3.0 hard drive randomly disconnects and connects

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