https://technet.microsoft.com/en-us/sysinternals/bb842062.aspx
https://technet.microsoft.com/en-us/sysinternals/bb842062.aspx
Check to make sure the laptop is getting an address from DHCP and it's not manually set.
The symptom you describe is what can happen if you have two devices with the same address on your network.
WiFi is a technology that looks good on paper but falls flat on its face in the real world. Gigabit ethernet on the other hand, kicks butt. Run a wire.
eh. WiFi is impressive when done right. A home system with a single AP, often in a less than great location due to installation considerations, can be sketchy.
That said, my single family home currently has a single AP that covers things pretty well. I did upgrade the antennas rather than connect to a second unit. And it's placed pretty well. And I have 10Gb Ethernet between it and my basement demark / server location.
1988RedT2 wrote: WiFi is a technology that looks good on paper but falls flat on its face in the real world. Gigabit ethernet on the other hand, kicks butt. Run a wire.
Yeah I guess all the video conference meetings we have at my office using WiFi don't work.
Or using the WiFi at my house to log in remotely to access our internal servers and do web conferences.
You're right, neither of those ever work.
Yeah, whatever. 
I have The Gordian Network. It's like the knot.
Have you logged into the ATT router with another PC and looked at what it thinks it's doing?
Also, try this: Get another router (I buy them at thrift shops for $5), plug it into the ATT router with a wire, shut the ATT wifi off, turn on the other router's wifi and try connecting to that. More points for running DDWRT on the new router.
Toyman01 wrote: It is only the wife's laptop that causes problems, it is the only system we have with windows 10.
There's your problem right there, it should say MacOS Sierra. 
In reply to Dr. Hess:
IME the Wifi on the cheap routers doesn't do it any favours. While I wouldn't spend more money right away to fix a problem that may or may not be related to the router, I'd put adding a good quality Wifi access point on a longer-term to-do list.
I recently went from going through a bunch consumer crap Wifi router/access points to a Ubiquiti Unifi AP-Pro. The Unifi wipes the floor with any of the consumer devices I had when it comes to stability and reliable throughput - not a surprise given that they're designed for corporate environments where you plaster a bunch of them around your office building. Oh, and they're only $130-ish.
They're a little more effort to set up because you have to run the controller software on your PC or Mac rather than use a built-in web interface, but once you've got them set up you barely need to touch them other than occasionally updating the firmware.
In reply to Toymanswife:
You threw it out the window already didn't you? 
Toymanswife wrote: This makes no sense... and as soon as I post this... it will probably change. It's working.
Is it still working?
I have Ubiquiti and Cradelpoint routers/bridges/access points on my networks.
Talked to a friend of mine about this. He said that Windoze 10 will also try to set itself up as a network sharing hub by default, besides the peer to peer thing, and that could cause your symptoms, TM/TMW. So find that setting and make sure it's off too.
The Ubiquiti units can use a dedicated controller too, USB or PoE powered and about $80, I think. I've worked with small businesses that use these with excellent results. The AC-AP Pro units are really good stuff.
On the high end, I also work with Aerohive & Cisco... the Ubiquiti stuff is absoultely as good until you get into having multiple SSIDs and multiple guest networks - the Ubiquiti is currently limited to a single 'guest' network policy. For home & SMB, this is not an impact. And the price is great.
Yes, it's still working. I'm not sure what really worked... just glad it's fixed.
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