As I mentioned earlier in this forum I was able to get around this problem by sending more power to the boards. With blissz firmware you're able to set each board individual power settings. I'd suggest to try blissz firmware and set the power of that board with less <60 ascis to a power setting more than 13 (bitmain default). I was able to get a D3 with only 55 of 60 asics showing with power settings to 15 or 16 back to all 60 asics and 0 HW errors.