All I can say is DO NOT BUY from HASHRA!
Bought 10 pack gridseeds - 6 of them DOA and of course no refund or anything. They are keep saying that my USB hub is not providing enough power bla bla.
I bought the hub they suggested ($60) still the same.
So the moral of the story - if something happen with your miner you are on your own.
what power supply do you have powering the gridseeds and who did you buy your power cables from?
if you're in the U.S. I'd be happy to test them for you. I bought a 20 pack from them and every one of them has been working fine for about 3 months now.