Q: wifi keeps dropping since Yosemite upgrade

Hi ..

Might be corrupted network preferences as a result of the upgrade.

Open the Finder. From the Finder menu bar click Go > Go to Folder

Type or copy paste the following:

/Library/Preferences/SystemConfiguration

Click Go then move all the files in the SystemConfiguration folder to the Trash.

Restart your Mac.

See if that makes a difference.

Your Mac will generate a new SystemConfiguration folder for you.

If that doesn’t help, try here >  Wi-Fi: How to troubleshoot Wi-Fi connectivity

Hi Matt,

I would suggest creating a new location in System preferences > Network before moving the "System configuration " folder.

Using network locations (Mac OS X v10.6 and later)

I'm having the same problem

I even tried to reset PRAM and SMC without any luck

I'm going to apple store tomorrow to fix my issue and will let you know

I have the same problem. The guys at the apple store had no solution. I tested my macbook with the wifi at the store and everything worked fine.

Back at home I tried to rum the MB with bluetooth switched off and without thunderbolt screen attached. It works.

Leaving the MB lid open and bluetooth switched on attached to the screen, wifi works too.

With closed lid, bluetooth on and attached screen there is no way to get a stable wifi connection.

i am very disappointed because bluetooth/ wifi problems are well known for some years now.

I had this issue last night and have not seen it after doing the following in:

https://discussions.apple.com/thread/6601075?start=0&tstart=0

I have this issue too. Moreover, my internet connection went from several MB/s to 5kb/s. I went back to the ages of modem dial up connections. This issue is pathetic. Apple should take care of these things before releasing the final version. Specially when this issues were reported during the beta tests.

I'm very dissapointed with apple this time. This kind of things can change my decission of getting a new mac when I have to replace my actual computer

In the most part, the WIFI is stable UNTIL I turn on the Bluetooth to use my Mac keyboard and pad. 

So both wifi and BT keep dropping when I turn on BT in order to use Mac keyboard and pad.. I have been in software QA for 15 yrs and I have to wonder, how the **** did their QA miss that?!!!!

submit a bug report to Apple: https://bugreport.apple.com/problem/viewproblem

There's no way this is a widespread problem in Yosemite.  It's got to be something local to your machine.  Try forgetting the router, delete the related preferences, create a new location, etc... 

I am having same issue with my 2013 mbp with retina both myself and my husband updated today his seems fine but mines not, we are connected to same Wi-Fi and his stays on and mine keeps dropping also dropping my bt every few seconds so impossible to use my magic mouse, so I do not believe it's just your machine many people have the same issue, gonna check mine again in morning and if it's no better will with phone Apple care or make an appointment to take it in:(

"There's no way this is a widespread problem in Yosemite.  It's got to be something local to your machine.  Try forgetting the router, delete the related preferences, create a new location, etc..."

Could you please not make assertions like that? I'm sure you're just trying to be helpful, but something clearly happened with the Yosemite upgrade. It doesn't mean the issue affects everyone; it could be the driver for a specific WiFi chip some of us are unlucky enough to be stuck with.

I am also affected by this problem.

This is what I have observed:

- If I shut down my MacBook, start it up without doing anything special with the network, then if I ping google I get a normal reply time.

- If I then put the network under a little load (specifically use curl to fetch the latest openssl tarball), the ping-time goes up fast, and pretty soon I start getting request timeouts. At this point the network is mostly useless.

- The breakage isn't complete though. If I keep pinging, I will eventually get a few packets which get through, albeit with very high delay. Some of the tarball downloads have actually run to completion, but rather than take the usual minute or so, it can keep trying for 15-20 minutes. Sometimes it times out and fails, but I'm getting some complete tarballs as well.

According to system_profiler I have:

Card Type: AirPort Extreme (0x14E4, 0xEF)

Firmware Version: Broadcom BCM43xx 1.0 (7.15.124.12.8)

..for some reason it thinks I'm in GB, which I'm not.

I have around 10 other devices (PC's, iMac, consoles, tablet, etc), some use wifi and some don't. Nothing else is on the network affected by the problem; it's only the MacBook which I just upgraded to Yosemite.

Could others who are having the same issue check what Card Type they have? Run system_profiler in the Terminal and look for the WiFi section (for me it's right at the bottom.. Beware that it takes a while to run to completion).

Some have suggested disabling Bluetooth. I tried that, but it didn't get any better -- until I rebooted. Now the connection appears to be working somewhat reliably.

I'm not sure it's a perfect workaround though. I saw one of the downloads slow down significantly in a way which resembled the problems I say earlier. Haven't tried it enough to know if it was just a normal hick-up or what.

Try disabling Bluetooth and if that doesn't work, like in my case, reboot.

I hve the same problem too. After upgrading to Yosemite, my macbook pro mid2012 keeps dropping my wifi connection!!! It was fine when i have maverick. Apple please fix this ASAP!