I just got the firmware and another definition update. After several sleep/wake cycles, as well as shutdown/startup cycles, I've determined that my wifi problem is not improved (well, maybe the speed, which I haven't tested in all this). If I shut down, when I start back up the wifi works immediately. If I put it to sleep, when I wake it up I have to turn wifi off and back on - it is "limited" until then. And by limited, I mean there is no connectivity. I was really hoping this would fix it.
I'm tempted - a little bit, not much - to reset the computer. But I've got so much installed... Visual Studio 2013, Telerik DevCraft, SQL Server 2014 (not set to run, but just installed with service set to manual start), and so much more - those are just the biggies. I'm starting to ponder whether Hyper-V is causing the problem, but not much I could do about that without uninstalling VS.