My Antminer D3 19.3GH/s stuck after running 6 hours or 2-3 days, chip status is 'xxxxxxxxxxxxxxxx' and hash rate drop.
After many nights can't sleep, I finally figured out the reason - D3 November batch but still run August firmware.

I would like to share with others so as not to encounter the case like me  .

//update video: https://www.youtube.com/watch?v=sQz1Ez1ekKo