Along with the release of iOS 8.1.1, Apple has also just released OS X 10.10.1 Yosemite to public. The OS X 10.10.1 comes with stability improvements and compatibility of your Mac including improvement on WiFi reliability, improve reliability when connecting to Microsoft Exchange Server, improves reliability sending Mail messages when using certain email service providers, improves reliability when connecting to remote computers using Back to My Mac.
This update is recommended for all Yosemite users. It should fix major WiFi issues that’s caused connection problem for a number of users.
You can download the update directly from the App Store.