Sorry Arachnaut, indeed you are, thank you
I posted this when I first got my laptop, then buried my head. I guess there were 2 parts to my issues here. One, it not turning on, and two, when it does I have to close a reopen Sonar to use it. I think in returning to the thread I became focused more on the USB device not closing down, so issue two wouldn't be a problem.
I did a software update (as opposed to driver) on the quad a few days ago. Although it still switches off, it now switches back on.