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I assume OP is talking about the issue that sometimes when the computer goes into sleep mode, when you wake it back up, the Wifi doesn't connect. And to fix it you have to turn Wifi off and then on again.

But please correct me if I am wrong, OP.
 
Those who do not have it; What router do you have?

I have a Linksys EA4500 and mine requires a manual wifi switching sometimes after waking up from sleep. Tried SMC / PRAM reset, reinstalling OS X.

2012 MBPr works fine on the same network.
 
I have this issue at one of my job sites witg only the actiontec verizon router that is there.

Very annoying, but all other 5 job sites and my airport devices at home work fine
 
No issues here with my mid-2012 rMBP, Mavericks, and Netgear R6250 router.

I did, however, have what appears to be an identical issue with my Lenovo Thinkpad W530 and the Netgear R6250 (and an ASUS RT-AC66R). This was a known issue with Intel's Windows 'Centrino' wifi drivers for almost 18 months, and was finally fixed only a few weeks ago. Perhaps the new driver in Mavericks has a similar bug/issue.

[Edit: Oh wait... this affects only the 2013 models? Nevermind... :)]
 
No issues here with my Late 2013, 13" rMBP. The router is some OLD D-Link of my sister - it comes from the times of Windows XP..
 
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I don't see such issue. I closed the lid every time when I am not using the my MBP. When I am back using it, it connect back to wifi almost instantly. I don't really see the issue other then VPN to my work will reconnect exactly every 5 min. No solution for that, but that is not wifi issue as far as I can tell.
 
I tried lower a beacon interval (50) on my router settings. It seems to be better but not definitive yet.

Talked to Apple, tried a couple of things on the phone. They did not acknowledge a known problem. They asked me to try another router and offered to replace the laptop if it was not a solution.
 
For some odd reason Apple seems to have had problems with Wi-Fi connectivity from time to time over the many years I've been buying laptops, iPads & iPhone's. It's almost as though they fail to take the issue seriously until consumers complain loud enough or return so many affected units that it costs Apple too much money. Why they fail to test and debug before shipping is quite revealing.

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Got an Airport Extreme yesterday, there seems to be no problems with it.

That's because it's proprietary to Apple.
 
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