Currently Being ModeratedNov 9, 2013 2:42 PM (in response to ThaBrad)
Thank you for the details of the issue you are experiencing with Wi-Fi on your MacBook. I would be concerned about this too.
I recommend following the steps in the section labeled, "Symptom: The network connection drops unexpectedly" in the following article to resolve an issue like the one you described:
Thank you for posting in the Apple Support Community.
Currently Being ModeratedNov 14, 2013 5:24 PM (in response to sheila_m.)
Ok here is it a little more detailed…
YES, it helps every time I use network diagnostics.
Opening up, the last 3 "leds" are red (ISP, Internet, Server), smt only the last two.
When I'm going through the steps I recognized, that also the Wifi-Settings led turns red for only a short blink, then everything works again and everything turns green again.
BTW, network diagnostics always triggers a "grant network diagnostics access to keychain" alert, which I answer with ALWAYS (which there CLEARLY seems to be a BUG, because it keeps asking me that every time I fire up the whole thing!).
AND thanks for the troubleshoot document link, but I think my problem is a little bit more advanced, so (at least I hope so) are my mac skills, which clearly doesn't help me much :-/. It's also such a weird problem. A crazy workaround could be an AppleScript which fires network diagnostics every 10min, but that's not a solution but rather a shame! And I also can't think of anything what could have messed up internal settings/structure that causes such a problem.
Many many question marks & and no idea where to find answers at all. ?!?...
Currently Being ModeratedNov 14, 2013 6:10 PM (in response to ThaBrad)
I'm guessing you aren't using a Apple wireless router (Time Capsule, Airport Extreme, etc). So here's my best guess/solution.
For some reason, after the Mavericks update, all my computers are having a hellish time connecting to wireless routers using bonded (aka wide) channels of 40 MHz width in the 5 GHz band. Now, historically, Apple hasn't really supported bonded channel connections from its devices, ostensibly because of the risk of interfering with Bluetooth...but setting the router to using 20/40 MHz channels in automatic mode was supported (ie, the router would provide either one, and the Apple device would negotiate down to teh 20 MHz wide channel). But since updating to Mavericks, I am finding that this fails and only 20 MHz channels are supported.
So, I suspect that you have a wireless router providing both 2.4 GHz and 5 GHz channels using the same SSID. Your computer is trying to connect to the 5 GHz bonded channel and failing. When you run diagnostics or turn off and on the Wi-Fi, it connects to the 2.4 GHz channel...but eventually it tries to connect to the higher speed 5 GHz channel again...
My recommendation - go into your router's configuration (via it's web interface, or whatever) and set the 5 GHz network settings to 20 MHz only.
Currently Being ModeratedNov 14, 2013 6:32 PM (in response to g_wolfman)
Great research you did there! At least it would explain why I don't have any issues with my iPad or any other device.
I have a Fritz!Box 7270 by AVM, so no Airport Anything. Only problem is, I can't make any settings for the 5Ghz Channel. Probably would need the the open-source alternative Firmware (which technically would brake warranty, but worst case there are always darn good recovery tool, but still - Apple Why Y So Stupido?!).
Any thought on changing that 40Mhz Wifi setting back on again?
I also have to check if the other very similar question (but with old white MacBook and pre-Mavericks) is also related to that
But thanks for that tip!
Currently Being ModeratedNov 18, 2013 5:33 PM (in response to ThaBrad)
After some experimentation, I factory reset the router. It appears that the last update to the firmware I am using also involved a change to the firmware SDK. Lo and behold, after the reset, there were additional system options present I had never seen before and the 5 GHz band started to work properly in 20/40 mode again.
I suggest you copy out your most important settings, factory reset your wireless router and enter the settings again by hand. Do not save and then restore the settings; if your problem is similar to mine, or perhaps involve corrupt configurations, then doing so could simply reinstall the broken configuration and not fix anything.
It was a bit of a pain in the a**, but everything seems to be OK on my wireless now.