Q: Mountain Lion no Wifi after wake from sleep

Yep for me also, did my head in for days until came across the transmit menu icon issue and system on my MBP now sweet. Used same fix on a friends MBP with same issue and all fine.

Been pretty quiet on this thread lately. Curious if people have been having the problem less. I never heard back from the apple guy, he never sent me his contact info.

I've been quiting all apps before putting computer to sleep and have not had a hang since. May start leaving certain apps open and sleep it to see if one triggers it.

Just when you thought it was safe to put your computer to sleep with apps open....

well... I closed my MBP for about 30 min and forgot to close out my apps that were open and woke to it being hung up again. I had a bunch open: Safari, Firefox, Transmit, Dreamweaver, iCal, Mail. I hadn't had a crash in 2 days of sleeping without having apps open. So one of them is not playing nice with the system.

Quit your apps, Sleep well, Wake refreshed

I have found Transmit definitively related in my case.

I had this exact issue after upgrading to Mountain Lion. Wi-Fi would hang / lockup on wake from sleep state.

The icon would animate on the menu bar, then would hang and display the pinwheel on mouse over. 

I formatted and clean installed Mountain Lion without resolve.

I then removed the Transmit Login Item from [System Preferences > Users & Groups > Login Items]

and I have experience no more issue. This was a 5+ times per day requiring restart.

The moment the screen went black it was the pinwheel of doom for Wi-Fi and a few other processes.

At least for me. This is finally "Fixed"

Hope this helps someone.

EDIT: Apparently this can also be done by a checkbox I overlooked...

Transmit > Preferences > General > [ ] Show Transmit Disk in menu bar.

I think for me it is almost definitively down to Transmit as well. However, I had removed the menubar icon as stated in a previous post and I still experienced the freezing of my MBP. So what I've been doing now is I make sure I quit Transmit whenever I am not using it and I haven't had the problem anymore.

But like Cabel said before it's seems to be any app that uses Bonjour, so I also made sure to disable Homesharing in iTunes, just in case.

Edit:

I am pretty sure ML AirPlay uses Bonjour as well, which makes me wonder if that could also be the culprit for some of you that are having this annoying problem.

Dear Apple, This is getting old. I paid for this "upgrade" and all I got was an unstable machine that I can't trust to go to sleep. Please fix this sloppy software.

Thanks for the fix anondrao and Cabel. I've only tried it once, but so far so good. All previous times I didn't log out when I put my MBP 2009 to sleep it was useless when I woke it up.

FYI - that's another workaround - log out before you put it to sleep. But removing the Transmit menu bar item is enough in my case.

I had the same issue and Transmit being active in the menu bar caused my computer and wifi to freeze. Once I disabled Transmit from the menu bar, my system works perfectly. If you don't use Transmit, I would suggest disabling other programs from the menu bar and see if this helps.

apparently, there are tow types of wifi disconecting problem. The one which is refered in this topic is disconect after wake up. This can probably be solved by Trnsmit menu configuration.

However, the other one has nothing to do with the programs installed. And it is disconnecting all the time, not just after the wake up.

Fix from Apple is desperatelly needed!

guys, this is not a new problem particular to mountain lion. For me this started happening since I upgraded to Lion last year. I was hoping Apple would fix it in mountain lion. Apparently not.

I purchased Apple Care and this issue has been going on for 1 year without any permanent solution.

I also had this same problem since Lion, and I've tried everything I can think of and most suggestions I've found. No joy.

Mine started with Lion but stopped after a couple of months.  Lion never acted up this much though.

I am having the same problem too.

5 minutes or 5 hours. It makes no difference.  Everytime I open the lid of my mid 2011 macbook pro 15" I'm asked what wireless network I want to join.

I made a new location called Home in network prefrences and it seems to work fine now.

I'll check it tomorrow after I let it sleep for 8 hours or so.

From this thread https://discussions.apple.com/thread/3192395?start=210&tstart=0

posted by laralea - deleting the wi-fi network service and making a new one seems to do the trick, at least it did for me

I hadn't had a crash in like 5 days. I was psyched. Then I realized that I hadn't used transmit that whole time. last night I had used it. Then went to bed with it open (it had been closed every time I had put the machine to sleep the past few times). And when I woke up this am. I was hung again. Had to force quit all apps and restart.

Blerg!