Hi Trevor,
Curious what model QHY? I use the QHY5L-II-C and at times everything else connected will work with the exception of this camera.
This last time I had issues I tried several things but what seems to remedy it was running the system memory
check on my laptop. The error I was seeing PHD2 was related to corrupted memory... so this seemed to fix it this time.
Here's the things I have done at one time or another to get the QHY camera working again.
One time the driver did it by downloading and installing latest driver (again).
Another option: run DEVICE MANAGER on your pc to look for hidden ports or ports no longer used etc and delete them.
Steps: Device Manager, View, Show hidden devices and look in the USB section or you might have an astrogear section I don't remember right now...
and look for items listed that are greyed out. Those devices no longer exist.
This may be of no help to you it's just what I have learned. I've had issues a couple of times and it's cut my night short or actually never even let my night start till I learned
how to detect the camera connection problems.
For reference I am using a 4-port mini USB hub, where I have the HEQ5 mount connected via EQMOD ASCOM, the QHY guide camera
and my Polemaster camera all connected. Most times there's no problem but if I do something out of the norm with my laptop (such as video capture from my handycam or
other...) it tends to cause the laptop some cornfusion is all I can figure.
Someone else with some smarts will chime in hopefully!