Wifi Issues Yosemite 10.10.5

I too am having this exact problem with my wife's MacBook Air running 10.10.5

She doesn't experience this problem with her machine on other wireless networks and the multitude of other devices in our house do not have a problem with the wireless dropping.

Running the Wireless diagnostic tool shows similar results in that it detects disconnections but doesn't attempt to repair or resolve them. It shows the country code message too.

We too have a Virgin Media Superhub:

Software Version "V1.01.11" Hardware Version 1.0

Can the original poster tell us whether upgrading to El Capitan solved their problem?

Cheers, Dan

and the multitude of other devices in our house do not have a problem with the wireless dropping.

Other devices may not have the same high demand for bandwidth that a MacBook has, so that experiment says there IS a connection, but it may not be good enough to support a Mac.

Hold the option key while you click on the Wi-Fi Icon in the MenuBar.

What is your RSSI/signal Strength?

What Channel? what PHY Mode?

What Transmit Rate?

How many other networks do you see?

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Grant Bennet-Alder wrote:

Other devices may not have the same high demand for bandwidth that a MacBook has, so that experiment says there IS a connection, but it may not be good enough to support a Mac.

Hmm, well I've had an iMac run over WiFi on this router and my wife's previous MacBook Air also running off it. Neither of them showed this problem.

So what is your actual connection looking like?

What is your RSSI/signal Strength?

What Channel? what PHY Mode?

What Transmit Rate?

How many other networks do you see?

Grant Bennet-Alder wrote:

So what is your actual connection looking like?

What is your RSSI/signal Strength?

What Channel? what PHY Mode?

What Transmit Rate?

How many other networks do you see?

You are using channel 8 on the 2.4GHz band. There are about TWO channels available there for 802.11n operation. You are competing with 16 other networks for those bands. The interference must be ferocious. It is a miracle that anything at all is getting through.

If your Router is capable of operating in the 5GHz band, that is what should be turned on and active. The Router may be mis-configured, with 5GHz turned off. The virgin media superhub appears to be capable of operating on both bands at the same time, when properly configured.

Grant Bennet-Alder wrote:

You are using channel 8 on the 2.4GHz band. There are about TWO channels available there for 802.11n operation. You are competing with 16 other networks for those bands. The interference must be ferocious. It is a miracle that anything at all is getting through.

If your Router is capable of operating in the 5GHz band, that is what should be turned on and active. The Router may be mis-configured, with 5GHz turned off. The virgin media superhub appears to be capable of operating on both bands at the same time, when properly configured.

Yep, same problem on 5GHz. Today, my wife reported the problem when she was connected to the 5GHz signal and so I swapped to 2.4GHz to see if that cured it. It didn't.

Again, my iMac and my wife's old MacBook Air (same model as this one) did not experience this dropping issue on either 2.4GHz or 5GHz.

The channels in 2.4GHz are tiny, and you need to combine five of them to get one 802.11n channel.You really do need to get off that crowded band and onto the 5GHz where there is lots of room and less competition.

You should not be experiencing this problem on the 5GHz band, provided you have set channel selection on the Router to "automatic". When powered up, the Router sniffs the traffic on all channels, and moves to a channel that is not crowded.

Grant Bennet-Alder wrote:

You should not be experiencing this problem on the 5GHz band, provided you have set channel selection on the Router to "automatic". When powered up, the Router sniffs the traffic on all channels, and moves to a channel that is not crowded.

Er, well yes. You are right. I should not be experiencing this problem.

I typed most of this, then forgot to hit reply, and before I did, I found the following:

Re: OSX Yosemite Wifi issues

But if that is the problem and you have tried using the 5GHz band, then you shouldn't have a problem, unless something is trying to auto-switch you. read on, I typed most of it an hour ago.

Long ago I had a WIFI problem I never figured out while using Lion, so I connected wired to do updates and problem went away. But much later I wondered if there was some catastrophic argument between router/macbook in re-negotiating data rates (bug), or even the mac spending more time looking for a better network than transmitting/receiving the data. Or trying to switch bands. I would try deleting all your preferred wifi networks except the one 5GHz you want to connect to. You might be able to do this by setting a new "location" in your network preferences and not really delete anything previously saved, but I have had problems understanding locations and saving settings. There are routers and devices that automatically switch bands, access points, and so on, and if some assumptions are wrong I could see things going badly. If you can, you could go into the router and (temporarily) turn off the 2.4 GHz band you are not using with the mac. Which makes me think of, can you go into your router and view its logs or status?

(when looking at console for other reasons) I have seen what I think are wifi scans even though I am connected to my wifi router at the max data rate possible for my MBA with an excellent signal/noise ratio. I've never understood it, but if it isn't badly broken, I don't fix it.

Maybe you should start a new thread under something other than mac book pro.

... and in my opinion, if a reasonable, uncrowded channel were available on the 5GHz band, your Mac would not be connecting on the very crowded 2.4GHz band at all.

This can happen if you make sure the 5GHz band is not turned off, and its channel selection is set to automatic.