After a year of ownership, I am conditioned to factory reset the DX5 II as soon as something doesn't look right!Works now. See my edit.
And no, I don't actually have the antenna connected, but I'm never far enough away from it for the antenna to be a factor.
BTW - I still loose the PEQ settings on mine, but only if I try to use Topping.Tune. I thought Topping.Home might be better, but that seems to have the same problem (not showing my custom PEQ saved to the device. I had also assumed that support for the Topping.home app would allow me to use the Topping Home web app, but this doesn't seem to be the case