Q: Ios9 drops wifi on iphone6

There are two different things at issue. iOS does disconnect from WiFi 30 seconds after it goes to sleep. However, it should reconnect immediately when it wakes up. If it does not there's something wrong, somewhere. And even if you move to a different location it should connect to a router that it has connected to in the past within a few seconds. As a first step you should go to Settings/General/Reset - Reset network settings. You won't lose data, but you will have to manually reconnect to each router the first time you encounter it. You should also reboot your router, to reset the process in it that assigns IP addresses.

'Reset network settings' seems to have resolved this.  Had to do it twice for some reason but my 'phone now behaves as expected, Thanks for the tip.

I am an IT manager at somewhat large hospital that has bought into the Apple phone wave. Against what I thought of Apple being a consumer grade device (SORRY Apple users) Remember I have to have something working all the time in a Hospital.

Lawrence I am not sure how you are testing this problem but I can tell you how I am.

We have over 610 access points (or you can call them routers) 200 IPhones at this point and planning 650. Then we have 100 IPods running the latest code. Each device has a battery pack on it. So we cannot use the power not connected being the problem.

We are seeing the IPods and Phones dropping WiFi with the screen locked and only when you have lost WiFi signal. IE elevator or stairs. For us to regain WiFi is to unlock the phone or iPod. Plus the phones do not have a SIM card in them. They are only WiFi.

Here are my notes from some of the testing.

We monitored the wireless connection of 15 iPhones. The biggest issue is the iPhone dropping wireless and not reconnecting. To test this, we constantly pinged each device every 2 seconds. If we saw a device failing to ping for over 2 minutes, we assumed this device had lost its network connection. We would then immediately try to locate the user and look at their phone. From our tests, the devices would stay connected to wireless as long as the user stayed on the unit. The issue arose when the user went off the unit via elevator or stairs where there is no wireless connectivity. The device would disconnect from the wireless as expected, but on occasion it would never connect back to the wireless once the user came back in range of an AP. On multiple instances we waited for over an hour to see if it would reconnect, but it would not. However, once we would unlock the phone, it would reconnect to the wireless after about 5 seconds every time.

Oh the Droid phone NEVER FAILED.

What you are seeing is not what I see. If my devices (I have 4) are connected to power they maintain the WiFi connection, and if they are temporarily cut off, they reconnect almost immediately. I use the same process that you describe, except my pings are 1 second. If I'm using a public network (such as my ISP's hotspots) they work the same way. Where I have see the situation you describe is if the network requires http re-login when you reconnect. I've worked in hospitals and other businesses where that is the norm; is it possible that yours works this way? The iPhone won't re-prompt for an http password after the first time unless you forget the network, then reconnect. The one where my current client is requires re-login via an http screen every 15 minutes.

Hi . i still have the same problem after update to 9.2.1   when screen is off my wifi sleeps and after i unlock the  screen  wifi logo come back in about 2 seconds ,yes it is an error or bug ,, what ever you cal it i think the same it is a software issue ..  if you find any solution  please let me know it  .Thank you

if you travel  then you would need to take your  Netgear N300  to travel too  

What I'm seeing (on iPhone6+, iOS 9.2.1) is that even when I'm sitting at the desk, not moving around, and all other devices remain connected to the AP, my iPhone disconnects from the wifi when it goes to sleep. It then does not receive push notifications.

This is a complete PITA, as I miss all sorts of messages and emails.

It may be a neat trick by Apple to stretch out an otherwise mediocre battery life per charge; but it's being done at the expense of important functionality. There should at least be a manual override.

this is the EXACT problem i am having.  it is incredibly frustrating because my  cellular data is blown through in no time.

May want to check this User Tip for suggestions.

Suggestions for Wi-Fi issues

Great tip; Thanks.

My pleasure....  In case you have not noticed, I also "liked" and commented on your tip on battery usage. I found it to be great myself and have linked to it on posts. When to charge your iPhone or iPad

Yes this works..Thanks.