i bought 5k imac , been having drops , connection issues wifi. spoke apple , told me following:
"open network preneces..
turn off wifi
click advance under wifi
remove wifi network (select network in list , select minus button below)
save changes.
open keychain access in utility folder..
click system on top left , click network on right , delete here too.
turn off computer.
reset router (even though working reset computer can new ip address lease)"
did , still keeps disconnecting wifi. it's 100% machine's fault have tried in 2 separate locations, both encountering same issue.
wanted see if had same issue before booking in appointment go , see apple in store!
cheers,
it's problem yosemite. make sure update 10.10.2 - solves many issues.
steps outlined apple need performed - seems location database gets corrupted somehow, deleting forces rebuilt (do after updating osx).
had similar issues rmbp, after updated osx , did these steps, fixed wifi dropping issue me.
followed steps here, , worked great afterwards. note changing packet size may or may not make difference (it depends upon wireless router). resetting smc bus appears over-kill , not necessary (i didn't it), problem appears entirely software-related within osx.
http://osxdaily.com/2014/10/25/fix-wi-fi-problems-os-x-yosemite/
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