Super disappointed in the quality of this shipment. When I received it, the E3 had one DOA board, plus the metal around the control board was loose and rattling. Now a second board has failed? Come on.
Bitmain is pulling the "Send it in for warranty" card.
Sorry for your bad luck but not sure what you expect Bitmain to do about it. EVGA has not offered anything different for my failed graphics cards. I send them in and wait for replacements.
I have been running 9 E3 units with A3++ power supplies since the first batch shipped. All solid and no failures so far. They are a nice addition to my graphics card rigs at less than half the cost.