Apple addresses Wi-Fi issues with update for OS X Yosemite
If you’re being troubled by intermittent Wi-Fi connection since you’ve upgraded to OS X Yosemite, Apple has finally found a fix for that with its latest 10.10.1 update for OS X. This update is intended to fix the issues plaguing the new OS as well as improve Microsoft Exchange server reliability and Back to My Mac connections.
Source: Cult of Mac