On my late 2008 MBP (yes I know it's old but it's still good for a lot of things, plus I have a Haswell desktop), I'm still having wifi dropping issues on the latest version. The drop follows a certain pattern. Open lid, have Internet. 30 seconds later, the connection drops. I turn wifi off, wait 10 seconds, turn it back on. Then the above happens 1 more time and after that, it's good to go. Not the end of the world but still very annoying. Never had any issues before upgrading to Yosemite. Does anyone have this issue or know any fixes to prevent this from occurring?