I just got by brand new antminer d3 in yesterday. I set it up on a few different pools to check the hash rate and all that stuff. It seems that no matter what I have a consistent amount of hardware errors on board 2. I have added #xnsub to my lines and it doesn't help. I upgraded to bitmains latest firmware and it still doesn't help. in example: in 10 hours boards 1 and 3 have 0 errors but board 2 is at 20,999. the temperature of board 2 is actually lower by a few degrees than the others. Also on certain pools is would have a couple of "x" for some of the chips on the board 2 after about 10 minutes. Is this normal?