I have an iMac12,2.
I also have the Wifi connection problem.
It appeared on this Mac under Snow Leopard, Lion and on Mavericks
from the beginning when I bought this machine. Once I thought I had
immigrated some bad data from my old MacBook. I tried upgrading
from SnowLeopard to Lion. No change. Meanwhile the connection was
stable for a while. The it becam disrupting again.
Two weeks ago I did the Mavericks upgrade with an clean install.
The wifi disconnection problem was not solved by this upgrade.
One week later I downgraded back to Lion and I have wifi disruptions
after 5 minutes.
I dont believe this is a hardware problem. If I read something on a website
it will disrupt after 5 minutes. If download a big file like 10GB the connection
is stable for hours.
I tried everything you can read in any forum, .plists, user-accounts, MTU,
other settings, wifi-channels, keychain deleted.
My network diagnosis window is always open for reconnecting to the internet.
Before reconnecting I see ISP, Internet, Server with red light not green.
While reconnecting I see wifi-preferences flashing red for a second.
It sometimes asks me for my router key. Mostly I have to coose my network
and proceed. Then it takes around 20 seconds to take me online again.
I guess its definately a software problem. Maybe the keychains or read-write rights
or the directory services.
This thread is too long to read. Any solutions found yet?