When it goes silent, does the
mod say that you have an open circuit, 0.0 ohms resistance? Is the IPv2 a
device where it "does nothing" if you're asking it to operate outside its range? For example, let's say you only want 20 watts on a 0.3 ohm could, that only requires 2.44 volts. But if the IPv2 doesn't operate at 2.44 volts, it has two choices: Either fire at the lowest setting it can, or "do nothing".
Perhaps your build is outside of some range, and it complains?