Q: iOS 8 5GHz WiFi issues

This fixed it for me. I was getting an ok wifi signal on 2.4ghz, nothing on 5ghz. I have an iPad Air with cellular, I set to airplane mode, popped the wifi back on and I get a perfect wifi on 5ghz.

Give this a try.

Thanks Jin Han 

YES I THINK I HAVE ANSWER.

i Have had same problem for 2 months since ios8.

SOLVED.   Because I use Apple's Air Port as Router I can actually see what each device is doing. (Just discovered this).    You are right.  Initially all my devices MacBook Pro, ipad mini, 5S , 6Plus, flip flopped between 5 ghz and 2.4 ghz     One by one had to change to 5ghz and forget any others.    Then saw

on the Air Port App in Utililies how one by one the Air Port Router  reset.  Then instantly all my files synced, unfroze and became active.   

Then i went to each device to check on the same Air Port App , that each device stayed on the 5ghz Channel.   The wifi speed was doubled if not trippled.  (Compared to the 2.4).   

So, you have to get each device to stay on 5ghz and then to get the Router to set/reset.    

Tip.    Once you set the 5ghz. Reboot device.  Check and double check if device stays on 5 ghz.  

I am not sure how can see all this inside a Router.  The Apple Air Port App  lets you see all this On Mac.  As does the Uutility/Air Port App on each device. 

I am convinced this is The solution.    I tried everything before this as everyone else has, the entire 2 month saga.   Apple was of no help!

Figured this out myself after over 2 months!

I do also experience this on my ip 4s when I updated it to iOS 8. But when i re-updated it it comes back to normal.

I found out that in my case it doesn't allow you to enter the 5ghz with an incorrect password message is because the mac filter on the 5ghz network was on.

So it seems an issue related to mac filtering on 5ghz.

TO PACHEL.  From: piano spinet  Dec 29th 2014

Think you are  getting closer to solving issue.   My MacBook does not have filter. ?  Everything with the 2.4 and 5ghz. Is listed in my router. If dual band router,  both are listed. The Apple Time Capsule  has an application so can see this.  I have the Apple Time Capsule and had to tell it to forget the 2.4 in order for it  to stay  on the 5ghz.  All my devices I did the same  to keep everything the same for syncing and iCloud  drive.   If do not do this, the router and the devices  flip flop automatically between 2.4 and 5 ghz.   Thus nothing will sync. 

THANK YOU!!! I think here in Europe Apple may have begun some compliance monitoring on signals on January 1st, 2015 when the regulation came into effect. I previously had my 5mhz signal parked in an uncrowded spot up on channel 100, which kept me out of my very crowded 2.4mhz neighborhood. That worked great, until a few days ago when 3 iPHone 4s models in my home -- all running different operating systems from 7.1 - 8.1.2, could no longer connect. An older model iPhone 4 could connect fine, as could my Macbook Pro, a Nexus Tablet, and my iPad 1.

I tried resetting, rebooting, but this was such an oddly selective failure, and simultaneous on January 1st, that I suspected a regulatory or protocol change from my cable provider or (more likely given the pattern of failures...) from Apple.

I think you found it. Once I shifted my cable modem off the 5mhz band and into 2.4 it worked perfectly.... (I tried using the "Auto" setting on my TC2700 U cable modem in the 5mhz band, but that didn't work and I suspect that means it isn't DFS compliant.

So, woot! And thanks again!

Here is what i did.  I changed the Network mode to 802.11 A/N/AC, channel width on AUTO and channel on AUTO.   i got instant connection with 5 Ghz wifi on my i pad and i phone 5.   Hope this helps!

I was having a similar issue. On the 5GHz band my download speed was <1 MB while upload was fine. I tried changing to a different channel on 5 GHz and now my iPhone 6 connects great and getting download speeds of 100 MB+. Changing the channel seemed to do the trick.

Same issue here with an iPhone 6 and iOS 8.2 : no 5Ghz WiFi anymore. My iOS 7 devices are connected to it while my iPhone can only reach the regular WiFi. This causes problems with Continuity (poor connection when placing calls from my Mac for instance), Airdrop works very poorly (never manager to transfer 1 file between the phone & the computer) and connection is obviously slower.

I really don't know what is happening! I tried to hard reset my iPhone 4s on iOS 8.2 but then it says I need Wi-Fi connection (that is what I am trying to fix! - my Wi-Fi connection!). Ugh! If anyone knows about this, please help me!

ok slightly old post but came home tonight and the 5ghz band has just stopped working but 2.4ghz is working. iPhone 6 ios 8.2. not made any changes or anything wondered if anyone has any ideas.

already reset router and done forget network etc but doesnt seem to have resolved it.

Help?!

Yes, same issue here also.

Changing router config to channel 44 for my 5ghz network resolved this issue for me on my iphone 6 (8.3), thanks.

Changing router config to channel 44 for my 5ghz network resolved this issue for me on my iphone 6 (8.3), thanks.

Same for me, iOS 8, iPhone 5s,

TimeCapsule.  I manually enter the 5G SSID and it worked (for now)