I too have the Quantum view 10 inch tablet. I purchased it with Windows 8.1 and then upgraded to 10 when it came out. I was disappointed when I began to have the same problems you had with yours. I was unable to find a way to get around this sleep problem.
In the meantime, I had a problem with the power button and so, since the tablet was still under warranty, I called Quantum suppliers and sent them the machine for repair. While I was speaking to the technician I mentioned the sleep problem with Windows 10 to her and her reply was that the power button would no longer work to put the tablet to sleep, but would only serve to turn off the tablet.
I really like Windows 10 and have it on my desktop and my laptop. I would like to have it on the tablet as well so that all my stuff would look and work the same. The sleeping thing bothered me so much that I asked her if she could put Windows 8.1 back on. I had gone over the grace period and could not revert on my own.
Anyway, I have my tablet back with 8.1 but I still would like to upgrade to Windows 10. After using my laptop or the notebook with windows 10, I find it's more satisfying than using the tablet with Windows 8.1.
If you find a resolution let me know.