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我是MBA2011版，更新完yosemite之后，wifi大概是每30秒就会断(手机热点分享)
遍寻不著解决方法，后来用了底下方法，到现在过了10分钟网络都没断，
分享给大家参考。
主要是:
1. 打开网络偏好设定
2. 选择wifi，右下角* 点选"停用服务" => "套用"
3. 选择wifi, 按下面"-"删除 =>套用
4. 重开机
5. 打开网络偏好设定
6. ＋wifi，服务名称一定要改成 wifi 2 or wifi x
不要跟原本的一样就好。
7. 按"制作"的时候，不要按"套用"
//不知道为何，但英文没写，一开始我选套用，但无法解决问题。
8. wifi活过来了。
https://discussions.apple.com/thread/6601075?start=30&tstart=0
JamieAscot Oct 17, 2014 10:31 PM
Re: Yosemite (OS X 10.10) killed my WiFi :( in response to GalagBasha
Guys, I have a Macbook 2008 Unibody, upgrading to Yosemite killed my wifi too.
Cannot turn it on at all, and it was stuck "off".
None of the solutions so far in thread worked (clearing PRAM, deleting
configuration folders etc. Did nothing).
But I fixed it, heres how:
1. Open Network Preferences, click once on the WiFi adapter in the
list there on the left. Then click the little cog icon at the bottom and
select "Make Service Inactive". Click APPLY.
2. Then click on the WiFi in the same list there again, and then click
the - button to delete it. Click APPLY.
3. Reboot the Mac.
4. Once rebooted, go back into the Network Prefs, and under the network
adapter list click the + button, and then in the dropdown list (which is
probably showing Bluetooth by default) select WiFi. For the name field,
change it from WiFi to WiFi2. It's important you add something to the name
here (I've just suggested to add a number 2), or else it will break again
on next reboot. Click APPLY.
You should then have a working WiFi, that survives reboots.
※ 引述《Koibito (恋人)》之铭言：
: 昨天更新完 Yosemite 我也发生 Wifi 会自动断线不会重连的现象
: Google 过几个方法后都没用
: 刚刚把 Router 内的 DNS Server 值清空后重启
: (我的路径是 DHCP Settings/Primary DNS)
: MBA 也重启后就恢复正常了
: 如果这个方法也不行的话
: 可以参考官方论坛看看
: "Yosemite (OS X 10.10) killed my WiFi :(" http://bit.ly/1wgEiq9