Could anyone urgently help please.
I have D3's plugged in, I've updated their Firmware to the latest on the Bitmain website and since then I keep getting this issue.
The chip statuses go to XXXXXX and hash 0.
I've tried reflashing it with the firmware again and doing a power down and on.
I appreciate any help, thanks!

Try to lower the freq and reboot your miner. I hope its works
Try to downgrade your firmware, i have notice that Nov firmware is not as good as previous one (sept/august)