Happens to me as well on a rMBP. There's also significant lag opening new tabs. I've had wifi issues on my phone since upgrading, where the iPhone will switch

Happens to me as well on a rMBP. There's also significant lag opening new tabs. I've had wifi issues on my phone since upgrading, where the iPhone will switch to LTE even though there's wifi available, from a network it remembers. Rebooting the phone will cause it to reconnect, so I'm trying this airdrop disable tip to see if it helps my connection problems.