The NAS was starting to work slowly, losing connection, unable to copy file when mounted in windows, just browse, etc...today it just stopped, lights still on, but connection timeout. Connected to router via the cable. I wanted to restart it and pressed/held the power button, it started blinking and never got off. After unplugging the power supply and then booting, it again was stuck on the blinking blue light and no connection.
Next step is trying a hard reset and then throwing the NAS unit I guess