IPhone 4S with iOs 8 dropping wifi when unlocking the device

Hi,
my iPhone 4S with iOs 8 (8.1.3) is often dropping the wifi connection when unlocking the device. This started to happen only with iOs 8, iOs 7 was just fine.
When unlocking the device after at least 2 minutes of inactivity, it seems to be weekly connected on the wireless network but then it drops the connection and reconnects back again at full power. This happens:
- really, really often, but not always;
- with any access point I tried (different wireless chipsets), both on DHCP and static addressing
- with any wireless channel
- both on 802.11g and 802.11n
- rebooting the devices sometimes temporary fixes the problem (for 12-24 hours), sometimes it doesn't
- restoring the firmware in DFU mode didn't help, neither did resetting all settings and restoring as new device.
I really don't know how to fix this, I can't find anyone else having this problem on the Internet.
Here's a video showing the problem:
http://youtu.be/4ua9CPzKBfQ
Thank you.

Started happening to me on my IP5 with ios 8, on public & private wifi, completely random and was really frustrating, I forked out for a IP6 128gb and was ok but its started to happen again so it must be an IOS8 issue. The unit keeps dropping wifi and asking for passwords it knows, ignores your input then comes back by itsself after a few minutes
To be honest Apple should be disgusted with themselves. The phone is pointless without wifi and if this is the solution it will not work as you cannot go to every router everywhere you go. $700 is a lot of cash for a useless bit of kit.

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