I don't think the problem is SGP. Are you running your guide camera and ASI through the same hub? That's the only time I ever saw this exact problem, and when I did, it would routinely hang like this. Also In my case, only a reboot would reset whatever it was that was conflicting. Changing the download speed from 90 down to 45 had no effect, but as soon as I moved the ASI to it's own USB 3 port on my laptop the problem disappeared. I have collected about 150 hours of data now at a download speed of 90 with no problems.
Larry