WiFi keep dropping after iOS 5 upgrade

I have the same problem.. Wifi shows its connected but the Internet connectivity on it drops. Tried using parllely with my windows pc and it works fine on my it but my iPhone 4 after the iOS 5 update has the connectivity drop issue . Never had problem with 4.3.5 firmware .. tried all sort of tricks like network restore , full restore using iTunes ,factory setting restore also tried with router by resetting it ,changing Channels , changing security encryptions but nothing seems to work.

Is Apple inc looking into it and planning to give some solutions to its customers ? Got my iPhone with lot of hopes but this issue is driving me crazy ...

Reposting from Can UK - this worked for me:

I did find a reply that has worked for me by Reiki Lotus as follows:

OK, here's the fix. My phone has been WiFi perfect for 24 hours now.

1. In Settings -> WiFi -> {your network}, click on Forget this Network.

2. Restablish a connection to the network you just dropped.

3. Once all the connection details have been filled in, go to the DNS field and replace everything that might be in there with this ip address: 208.67.222.222. This is the OpenDNS server.

This fixed the problem both at home and the office. I am also using WPA2 security and have not had an issue.

More info is at this site: http://www.madbot.org/?p=189.

Thanks,

Ned

Message was edited with more detail by: Reiki Lotus

HI Guys,

I was experiencing the same problem. My wifes iphone 4s connected to our home wifi but my iphone 4 would not. I tried everything listed above (except changing the channel on my modem or router) and none of it worked.

To get it to work, all I did was disconnect my home PC from the wifi and the iphone 4 connected a couple seconds after. Coincidence? Maybe but it might help some of you more 'techy' guys determine the real problem.

I connected my computer back to the home wifi and all my devices listed are still connected to the same wifi 1 hour later.

Also wondering if 2 Apple devices connected to the same wifi might be triggering the problem? Just a thought.

Tried the reset as suggested and it remains a problem.

GH

i had the same issue with my iphone 4s,ipad and ipad 2...and i have a adsl modem connected to a wireless router.

after trying everything i changed the ip for wireless router and disabled the DHCP server on it.... the adsl modem still has a DHCP server.....

and it worked...

I am glad it worked for you. So how does one do what you say you did?

GH

my iphone/ipad havent dropped a wifi signal since...connect to your router 192.168.1.1 and find DHCP under LAN settings. try disabling DHCP server on your router...it might work for you aswell

gud luck

After upgrading to os 5 on my iphone 4 I too am losing wifi constantly. Rebooting solves the problem for short periods but is not a great fix. I have several other computers that connect and maintain connections to my wifi just fine, as does my ipad which is not yet migrated to os 5 (thankfully) and which rarely loses connectivity.

This is REALLY annoying.

I had this problem but it seems to have resolved itself since upgrading to ios5.0.1. Haven't had to touch the router since or reconnect to my wifi connection.

Worked around this iOS 5 bug by downgrading router from WPA2 Personal to WEP encryption. WiFi connections now stable.

Network config is D-Link router used as WAP with routing turned off, connected via wire to TPLink wired router, connected to cable modem.

Symptoms were iPhone 4S, iPhone 4, iPad 2, iPad losing WiFi connection every 5-10 minutes even though physically close to router, while Android, Windows and OS X clients worked fine.

I have wifi connection problems too, on my iMac and Macbook Air right after upgrading to OS Lion, and on my wifes iPhone 4 after upgrading to iOS 5.0.1

To me it seems that the problem lays with iCloud syncing over Wifi. My iPhone 4S with iOS5 seems to sync in the background, even with a dark screen, the moment it is on power and within reach of my home wifi.

The Lion issues I solved thanks to this post http://osxdaily.com/2011/11/06/lion-wi-fi-problems-solution-mac/

With my same old 3COM router, same setting, Lion works fine for several days now.

For the iOS5 issues with my wifes iPhone 4, I still have not found any solution that does not involve jailbreaking. She was not able to connect to het work network or any other public wifi network. Wifi is not greyed out, but simply keeps searching for networks.

Just wanted to echo all the comments and keep this thread fresh. I've had this problem consistently on my iPad 1, iPad 2, iPhone 4s'es, iPhone 3GS (you get the drift). For all but the 4s, everything worked fine before iOS 5. Of course, the 4s came with iOS 5.

Just like bobsil1, my OS X Mac works just fine on my home network. Like a lot of other users, my iPad 2 and iPhones have the exact same set of issues on other WiFi networks.

My home network is Airport Extreme based. Work is a Sonic Wall.

Interesting nuance to my home network. I have a Time Capsule hard-wired to my Airport Extreme (but acting as part of the same network to extend the wireless and simply passing along IP addresses from the AE). I don't seem to lose any connections to the Time Capsule (although for some reason the iOS devices can't see beyond the Time Capsule to get an IP address). Again, Macs work just fine!

I received an IPAD2 for Christmas and as suggested to "improve my IPAD experience" upgraded the software to IOS 5 (when it was working great with IOS 4.3). I have been reading each post and trying every single suggestion (from rebooting router, changing channels, disabling DHSC, resetting ipad many times, etc etc) but nothing seems to work. Wifi connectivity is so bad that it takes for ever to open the apps store, and I am not even able to download applications...and haven't been able to open itunes store since the upgrade. Needless to say laptops and iphones that have not been upgraded have no wifi connectivity issues whatsoever. I am trying to downgrade to 4.3 through jailbreak, as I don't see APPLE fixing this bug anytime soon (posts come from october 2011 and it is almost january 2012! I really feel that I want to throw this tablet out the window! Anyone has any recent potential solutions? When is Apple releasing a fix for this issue that seems to be affecting so many users? NOT AN APPLE FAN RIGHT NOW.

Absolutely no issues for me with a Time Capsule-based network on an iPhone 4S, or the network at the hotel I recently stayed at, or Nordstrom's in-store Wi-Fi, or…

I still believe most of these issues are interference-related in some way and it's a matter of figuring it out, which is why contacting AppleCare in each and every case is so important.

It's only with that mass of data that Apple Engineering can find any commonalities if it is, in fact, their problem, or to have the data to notify third party router vendors if it's theirs.