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我是MBA2011版，更新完yosemite之後，wifi大概是每30秒就會斷(手機熱點分享)
遍尋不著解決方法，後來用了底下方法，到現在過了10分鐘網路都沒斷，
分享給大家參考。
主要是:
1. 打開網路偏好設定
2. 選擇wifi，右下角* 點選"停用服務" => "套用"
3. 選擇wifi, 按下面"-"刪除 =>套用
4. 重開機
5. 打開網路偏好設定
6. ＋wifi，服務名稱一定要改成 wifi 2 or wifi x
不要跟原本的一樣就好。
7. 按"製作"的時候，不要按"套用"
//不知道為何，但英文沒寫，一開始我選套用，但無法解決問題。
8. wifi活過來了。
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 (戀人)》之銘言：
: 昨天更新完 Yosemite 我也發生 Wifi 會自動斷線不會重連的現象
: Google 過幾個方法後都沒用
: 剛剛把 Router 內的 DNS Server 值清空後重啟
: (我的路徑是 DHCP Settings/Primary DNS)
: MBA 也重啟後就恢復正常了
: 如果這個方法也不行的話
: 可以參考官方論壇看看
: "Yosemite (OS X 10.10) killed my WiFi :(" http://bit.ly/1wgEiq9