After 6-7 months it began rebooting itself several times a day. At inconvenient times of course. It has the latest firmware and I never used a hard drive in it. I tried the tip in the knowledge base about turning off upnp but it didn't help.
All the features; Works great when it stays on
Sending it in for warranty leaves you without a unit; Going to see if they'll ship a refurbished one but not holding my breath