I have one, oddly enough, A DNS-320, it doesn't work properly.
Neither does Dlink.
Noticed them fixing anything lately ?
Notice them all over the board, helping out, offering advice, fixing issues ?
Have you ?
Tried asking them to fix the issues ?
I have.
Nothing.
Nada.
Zilch.
And for quite some time.
Like I said, they have our money.