The unit has been working fine for about 6 moths, but now it doesn’t stay on. It doesn’t start from the power on bottom on the unit; I need to either use the remote control or power cycle it. One it turn on the “WD” light goes on for a couple of second then the fan underneath start, the “WD” flas…

I would refer you to this thread http://community.wdc.com/t5/General-Discussions/Help-Hub-powers-up-WD-light-flashes-then-powers-itself-off/td-p/104158 The remedy to that problem is in page 7.