Since upgrading my Sony Vaio laptop to Win8, I have a devils job seeing my NAS and also get recurring WiFi dropouts; all Win7 Laptops/PC's + PS3 + iPad + TV are fine and dandy.
I've tried lots of "fixes" on the web, but it just isn't playing ball... got to be software NIC related.
I have a full copy of Win7 Ultimate, so it may just go back on.
Perhaps if you can't find a solution tell them to whack Win7 on it and you'll be happy.
i have windows 7 on it just now, that is where the new problems are lying,
as said earlier it came with w8 and have lots of probs with adobe, etc etc etc and it is not bluetooth dongle supportive so put w7 on it and the bluetooth internal chip will not work now, according to sony i have no back up from them as if you change the opp system on one of their comps they will wash their hands of you.
it would seem from my problems and your problems that if you change a pc to w8, or a w8 pc back to w7 it just doesnt work properly no matter what you do.
this is why i thinking to get the refund and buy the strongest w7 laptop i can find.
i paid £700 for the viao so i am thinking that will buy me a good / fast w7 machine as they must be a lot cheaper now due to w8 launch.