Bizarre networking problem with multiple 8.1 GA systems -- RT and Pro

Hi everyone,
I'm having a particularly bizarre problem with the networking on two Windows 8.1 machines, one running Pro and one running RT. Both demonstrate the same behavior.
In both cases, networking (wireless most of the time, although I'm not sure it matters) works fine for some period of time. Eventually it just stops working. Resetting the adapter, or flipping in and out of Airplane mode will bring it back again. The issues
happen on at least 3 wireless access points. In most cases, the networking actually appears to be up -- the limited access warning icon isn't up, although occasionally it does realize the networking isn't working.
Here's the bizarre part -- on both systems, local IP connectivity is fine. I can communicate perfectly well between devices on the same internal network, wired or wifi. During the time the networking isn't working on one or the other 8.1 system, other systems
on the network running Windows 8 (and other systems) work fine. There's no correlation between one 8.1 system stopping working and the other.
On *both* systems, when the networking appears to be failing, a traceroute actually gets 4-5 (or more) hops before going out to lunch. Other systems on the same internal network will cruise along to the same point on the route that is failing on the 8.1
machines and keep right on happily continuing the trace.
So that's the bizarre thing -- something on two 8.1 machines is doing *something* to the packets that is causing them to not route properly to a target system 10-15 hops away, the same routers handling the same kind of traffic from other systems behind my
firewall work fine, and whatever is happening to the packets that is causing issues resolves itself for some period of time if I reset the adapter. (The two systems are a MacBook Air and a Surface RT, so there's no drivers in common between them, either.)
I'm completely at a loss. Anyone see anything like this before, or have any thoughts on what to check?
(And, please, if you're one of those Microsoft support forum people who skim questions for keywords and cut-n-paste back a generic reply without any actual understanding of the problem -- like so many replies on here -- please do not waste my time. I am
trying to find someone who knows Windows 8.1 networking, not someone who knows just enough English to use ctrl-c/ctrl-v)

Hi George,
There is a known issue about Cisco device. It caused some windows 8 clients disconnected from wifi. I understand your windows 8 clients works fine, when the issue occurred on windows 8.1 clients. However, I think the KB article is worth a shot
http://support.microsoft.com/kb/2749073
Best regards,
Alex Du
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Regards, Ganesh, MCTS, MCP, ITILV2 This posting is provided with no warranties and confers no rights. Please remember to click Mark as Answer and Vote as Helpful on posts that help you. This can be beneficial to other community members reading the thread.

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