So, fifth day starting: 
- still running v3.10-rc4-saucy with an up-to-date raring,
- bt dongle moved around (back and forth) between screen's hub and PC,
- several 'phablet-flash' commands run

I can't diagnose the usb errors mentioned in the previous comments
(error -71), but basically, while the bt devices are still lost under
certain conditions (more about that below), they always come back so at
least the issue is not critical for me anymore.

The bt devices are still lost from time to time but after they get
rediscovered and are seen as new by X11 after some time (it's hard to be
precise here, the order is tens of seconds).

When this happens, I have to issue 'xmodmap ~/.Xmodmap' and
'~/.xprofile' to restore my own settings which is inconvenient but far
less than having to reboot ;)

I think the 'phablet-flash' issue is only revealing some unrelated
issue, possibly in the screen's usb hub but the issue this bug is about
seem to be addressed in v3.10-rc4-saucy.

Feedback or advices about how to refine the diagnosis highly welcome.

I'm a bit hesitant to  tag the bug 'kernel-fixed-upstream' without
better understanding.

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https://bugs.launchpad.net/bugs/1169961

Title:
  bt devices lost with no way to recover them

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