My DNS-320 has been fine for months - a few problems with sharing to os x but nothing too bad. I recently tried the beta version 2.01 and didnt really see any improvement, or any problems.
Yesterday I tried to reboot the unit - I hadn't really noticed where it did this before but I thought the power light was flashing for a long time. When it stopped and went solid like the 2x HD lights I couldnt find the unit on the network..
I've tried mixes of having the HD's out of the unit / in the unit / resetting the box via the pin on the back and occasionally the unit comes up. On one of the bootup's I flashed it back to the 2.00 release of the firmware however that has made no difference...
Edit: I've just left it for a while turned on and with one HD in the Right bay... the power light has turned off and the right disk light is still on... weird?