NAS will freeze and become unresponsive

I have the power now since about 1 year.
and it freezes repeatedly. Since helps just pull the plug.
After I constantly waiting for new firmware which solves the problem, I have now unfortunately but only awarded one star.
Because the problem is not resolved, despite Firmware 6.2.2.
Incorporated are the correct shared disk .....

The subjective feeling of secure data storage is not possible with this device.

a star is available for the surface ...

*** UPDATE **** 2/23/2015
by e-mail correspondence with the manufacturer turned out that I have no software warranty ....
It must be a software problem. After I now have no software warranty (one has only 90 days) I could
purchase a support contract.
Now I have a machine with 36 months warranty ... the irregular freezes .. and must again buy a support contract for software ...
As you look forward to coming back to new when you have learned something so.