ah thanks for the update, i see what you mean now,
it does sound like there is something wrong with that drobo…
if this has been happening often for you (or more often than you would like), i think its worth getting in touch with the support team, as they may be interested in, and able to figure out what is going on, from some diagnostics logs.
in case it is something with this particular unit, the below probably wont help much, though if you need some older versions to try with, there is a good link here:
(and alternative o/s versions can be found by going up a level)
i still use dashboard v2.5.3 myself, which works great across all my currently working das models, gen2, drobo-s-gen2, and 5d, (possibly also for my gen1 but that has a problem currently)[hr]
btw, is there any more info you have about the setup you are using, and the other units you had problems with?
are they all connected in some way (such as the same coomputer, cable, port, and multiplug ups or something) - am just trying to see if there is anything else that could be causing things, (or if it is just an unfotunate yet unrelated event that seems to be taking place more often for you)