http://www.notebookcheck.com/Test-Chuwi-Vi8-Plus-CWI519-Billiges-Windows-Tablet-aus-China.158767.0.html (sorry in German) test from 16.02.2016 and he have problem with the SD-Card.
I think the Build-Quality is different and you get from Device to Device a kind of suprise, depending on how well was the Build-Worker.
I deinstall the USB-Driver in the Device-Manager and on the first, he solve not my Problem. But with the second Deinstall the USB-Driver I can partially solve the Problem.
With my aktive USB-Hub (Banggood) I have a USB-Connection without reboot.
But I have a new problem with the Rotation and the Bosch-Accelerometer.