Well the wake/sleep issue is cleared up still it seems on 17.12.0,5, however I had a connection drop today while on Wireless AC at home. I'll try switching back to 17.12.0.4 but I'm not sure a minor revision will make a difference in that.
I'm just so disappointed in this card, especially that it is in my brand new Dell Venue 11 Pro, which is not a cheap device.
EDIT:
17.12.0.4 didnt help either, if anything it was worse. I'm on 17.1.0 now, again, which I hadnt spent much time on because of the sleep problem, but now that we know the power management checkbox needs to remain enabled to rectify that issue, I'll try these to see if it stabilizes my AC connection.