I am having an issue with my macbook pro purchased in Feb. 2013 and running the latest version of Mavericks (10.9.2) with random repeated dropped Wifi signal. Problem occurs with multiple WiFi routers and locations and other machine/devices in the same area connected to the same signal are unaffected. After two days of chat support (which cost me $19 each time, because I am traveling outside of the US) and lots of testing, including:
reseting SMC
reseting PRAM
clearing out keychain passwords
clearing saved networks
setting priority on network ports
setting inactive on non wifi ports
deleting all files in /Library/Preferences/SystemConfiguration
seeing the problem with a new user
seeing the problem in safe mode
seeing the problem in the OS reinstall mode
It was determined that my problem was hardware related and needed to be serviced. Also, because I am traveling and will not be back in the US for several months this will be an out of pocket expense for me. I spoke with Customer Care and complained about the poor quality and the fact that this issue started so quickly after my 1 year warranty expired (less than a month), and while they offered to recover the costs of repair, if I could bring the machine back to the US, they could offer me nothing while I am traveling, even though the repair would be covered world-wide under apple care. I asked if they could apply apple care now, I even offered to buy it, to ensure that I would be covered while I am traveling, in case something else goes wrong (which I am fairly certain is bound to happen).
I am so unimpressed with the quality of apple's mac books as of late that I do not plan on buying apple products again. This is the second macbook pro that I've had in less than two years with hardware problems that I ended up having to pay to repair, both less than 2 years old. Apple had a chance to make things right for me by either offering to cover the machine under apple care, or at the VERY LEAST allowing me to purchase it now, but sadly these are not options and I am left with a very expensive laptop that is prone to hardware failures, and even more expensive to fix. Sorry to say, but after years of cheerleading apple products I think Im ready to start looking elsewhere.