WIFI issues..still!!
When is my expensive Mac going to be able to stay on WIFI longer than three minutes?! I even had to restart this post twice just to send it, since WIFI drops all the time! Yosemite is horrible!
Send Apple feedback. They won't answer, but at least will know there is a problem. If enough people send feedback, it may get the problem solved sooner.
Mail/Provide Mail Feedback
Or you can use your Apple ID to register with this site and go the Apple BugReporter. Supposedly you will get an answer if you submit feedback.
Wi-Fi: How to troubleshoot Wi-Fi connectivity
Wi-Fi Problems in OS X Yosemite
Also try turning off Bluetooth.