I just had the DHCP connection problems: Everything works perfectly with fixed IP addresses.
The price for a 4-bay is amazing and they work perfectly for over a year.
The latest model purchased has detected a problem on a "volume" to 3 discs, in Raid 5. I added a 4th disc 4 TO, the system has patiently rebuilt the whole, and I even bit recover the faulty disk ! A flawless for me.