I came back from holiday, and my 3 TB my cloud showed a steady blue light. I cannot reach it via CFS (windows shares), ssh or via the web UI, however. All connections simply hang forever.
It does respond to ping however.
Restarting the device results in a white LED for a long time (~30 minutes) but it does eventually go solid blue.
I know the power went off once or twice while I was away as I got emails about the device restarting.