Could you describe your WiFi issue and your resolution?
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Basically this is what I posted to one of the other threads. It wasn't a major issue because it was mainly focused on using a toggle menu to connect to my wi-fi, but since I hadn't experienced this wi-fi connection issue under Lollipop, the time connection delay under Marshmallow was annoying me enough that I went looking for others with the same problem and found a temporary fix. Here's a condensed version of what I posted in the other thread and for the record I'm not seeing any noticeable battery drainage with this temporary fix.
"My only current problem with Marshmallow has been with the authenticating time connecting to my WiFi network. Before, it too me 5 seconds. Now whether on the 2.4ghz or 5ghz band connecting to my wireless router, I'm counting 23 seconds to connect. Deleted both networks and started fresh, but same time delay.
Yeah, it's kind of strange. Having a toggle menu, any toggle menu, and pressing wi-fi off and on from there is where I'm getting this time delay. If my wi-fi is off and I access it by going into settings, flip the WiFi switch to on, it'll connect to my WiFi in 5 seconds. Verified the same time delay with other WiFi networks if I use a toggle menu. Go figure! I'll play about with it and see if I can figure out why it's only happening with toggle off and on button widgets that I have on my main page screen.
Edit : known issue not just happening on the Nexus 7 forum. Nexus 5 owners are also experiencing this issue after upgrading to 6.0. A temporary fix by going into settings, location, access the top right menu, scanning, flip the switch to turn on WiFi scanning fixes the problem. Now how this affects a hit on battery life, I'm not sure, but when location isn't turned on, then I can't see it draining all that much power. The bug has been well documented by other users, so I'm sure Google is now aware of the issue with hopefully a fix in the works. "