I just re-installed Yosemite on my rMBP and I'm having this annoying issue with wifi networks. There's this unprotected "linksys" network and my laptop keeps connecting to it, even though I'm at home and my own signal is stronger. I've removed it from the "preferred networks" but it keeps reappearing. I want to say it has something to do with keychain or iCloud but this is where Im lost. None of my other devices (iPhone 6 and iPad Mini) do this. They connect to the right network 100% of the time. Please help!