help!

[belfastraven]

After removing, reinserting, turning on , turning off the EMMC switch, I often need to hit reset to have the pbp work properly. I don't think the emmc was the initial issue. The flashing red/green light indicates a "panic". Had you performed the same activity successfully before with the same size input file?. Was the machine getting very warm?
Do you have the smarmontools and nvme-cli software installed so that you can check the NVME? You will be able to see what errors have occurred and to check the health of the device.
Do you have a serial cable for debugging? It would be helpful for you to watch what is going on when you run that type of conversion.