Help with puzzling wifi range problem on Macbook Pro

Hi There,
I am experiencing wifi range problems with my MacBook Pro (10.9.4).
Our wireless modem (Arris DG860) is located in the office, in the center of our home. The wifi bars register full on my Macbook and the internet works well in office.
When I move my Macbook to the lounge room, 6 steps away, my internet stops working despite wifi bars remaining full. We also have an Apple TV in the lounge room (I have airplay disconnected on Macbook). 15% of the time, I can somehow get the internet to work in the lounge room (sometimes just by disconnecting airplay),then it mysteriously stops- with wifi bars remaining full.
85% of time, the internet doesn't work at all in lounge room (still full wifi bars). Other rooms of the house that are similar distances away from modem experience the same problem. We did not experience this problem with our old Macbook pro (purchased in '09). With our old Mac we had same internet connection, modem and Apple TV.
The only place our current Macbook receives good internet connection is in the office.
We also have an iPad and two iPhone 4S'
Any suggestions anyone? TIA

Most people who live in neighborhoods or apartments are not blessed with so few WiFi transmitters to contend with. There are no clear channels for most people, even assuming the user knows how to optimize their router, which most people don’t.
I would also explain that I am FCC licensed amateur radio operator K5ZN extra class. I know how radios work and how electromagnetic waves behave. Every diagnostic and symptom tells me there is some incompatibility between my MBPs radio and specifically the Comcast modem-router. In another discussion I gave some technical information about the problem which I spent several day diagnosing while using two different Comcast "Docsis 3" routers.
I have not seen this WiFi problem when using Airport or other standard routers like Linksys or Netgear. The OP didn’t say what router they are using. My suspicions tell me that Apple is moving in the direction of a very sensitive power-saving radio while ISPs are trying to blast the neighborhoods with powerful WiFi. The result is that my poor Macbook can’t get a good signal.

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