AntMiner S5 chain #2 intermittently operational Why is my AntMiner S5 chain only intermittently operational? What could cause this, how could I diagnose it, and what is the solution? Will BitmainTech replace it for me? How do I know if it's under warranty? Is there a warranty?
Why is my AntMiner S5 chain only intermittently operational?

It's due to hardware failure.

Will BitmainTech replace it for me?

Yes, I had the same issue. I had to pay to ship it back to them, and they very promptly shipped back a replacement board.

How do I know if it's under warranty?

Ask them. They're able to figure it out for you.

Is there a warranty?

Yes, I believe it's 3 months (90 days).