Was waiting to see if one of the more knowledgeable would chime in.   The only thing I can think to check is the heat sinks on your chips.  Make sure one of them didn't come loose during shipment.  I believe if the volt setting lights are flashing then it's an over heating indicator.   And if you put your hand on the exhaust side of the miner, is the fan blowing out really hot air?   Mine has been running now for just over 4 hours on volt setting 3 and 581 Mhz and it's barely warm air coming out of it.

I'm also getting the nonce errors but on chip 0.   However now at the current settings, it's not happening as often as it was.