Thank you, blissz, for your efforts!

Actually I have not tried the modded firmware (need to get near the ASIC before).

Two small wishes:
1. Please make some king of "exteneded logging" for D3. The original kermel log window is poor.
2. Enable GUI access for {some} cgminer switches. Yes, this old story for #xnsub #skipcbcheck and compatibility with some pools - more possibilities for testing and turning...

Thank you in advance!

Just got two new D3. Had the same kind of problem with them. Random failures  with red LED blinking (failure LED) , coolers at max, noise and sometimes loosing network connection. Only cold reboot helps.

Noticed that behavior when touching the device or just the network cable.

Finally managed to repeat the failures manually with both units by messing with network cable, but not disconnecting it. We have done some dangerous tests.

Removing the front panel solves the problem completely. Looks like the front panel contacts sometimes with metal RJ-45 socket on board causing device failure. Reproduced this on video.

https://youtu.be/-Kug4HwiFYY

Please donate LTC  if it helps: LKPV84ysTA3eR58oCAoLwUgLPUyuxLcgdu