Same here. I researched and researched for months before updating to make sure I would not have any problems and here I am. I have to reset my Wi Fi just about every time I start Explorer. It started immediately after I downloaded the 8.1 update.
I have been checking and rechecking every thing thinking that maybe I had done something wrong. I even called Toshiba the maker or my laptop, and was kind of crossed with them for telling me to update the driver, before installing 8.1.
I tried every thing I could think of with no results. When I found that Power Management place and saw that power saving button there, I was so happy. I thought, I had found the answer. Wrong!!!!
I have never had any trouble with my router before the update. So, I am a 100% sure it has to do with it. And that is not the only thing. So far, I have found several other things that got mixed up since the update. I just updated 2 days ago. Oh! why did I do it. Why has MS done this to us. Why didn't they make sure that everything was working fine before launching the faithful Windows 8, and then again when they tried to fix things with 8.1. What a mess!
I haven't read all this thread yet, but I plan to do it, to see if something has been found that works. I hope MS is working on it, and let us know as soon as they find what to do about this.
My Router
Netgear N600 Wireless Dual Band Router. My next step will be to give them a call and see what they have to say.