use the command -lidag 2 and see if that fixes it. There is an inrush of power at the DAG generation phase, and your power supply may be too sensitive to it. By slowing the DAG generation just a bit your power supply may be able to keep up. I had this same issue on a couple rigs and this fixed it.
Interesting, I used the "-gser 5" to achieve the same thing, I must have missed this one in the readme file.