I have been using DNS320 for quite a long time now (more than a year, maybe two), and never had any problems with it.
Few days ago it started disconnecting by itself from the network, and i could not access it at all (web interface or network shares). It just disappears from the network, tried to access it from everywhere but no luck(PC, Laptop, Raspberry Pi, TV, Phone). After a hard reset its back on line. The unit itself is working, all the lights are on, HDD-s are spinning, cooling fan is working.
I think that Raspberry Pi running openelec, is somehow causing this. I did some testing this morning by unplugging the Rpi, and when i came back home 8 hours later NAS was on line, I tried a 1080p video file on my TV and it played with no problems, but as soon as i started the Rpi and selected the same file, it went offline.
Please help, I use my NAS a lot, and last few days have been a true nightmare.