I know that there are some threads about Wifi problems in Lion, but they all seem to describe a problem different to mine.
- Macbook Pro (end 2008) and Macbook (Mid 2010) with Lion 10.7.2
- iPhone 4 with iOS 5.0
- iPhone 4 with iOS 5.0.1
- iPhone 3G with iOS 4.2
- iMac (early 2006) with Snow Leopard 10.6.8
- Router FRITZ!Box 6360 Cable (kdg) Firmware-Version 85.04.92 (latest firmware available for this device)
All Lion devices and all iOS5 devices suddenly stop transmission via Wifi, even within a transmission in progress. Example: I start the Twitter app on my Macbook Pro, the timeline loads, the profile images start loading, but not all images load, many remain blank. After that, no Wifi transmission on any program is possible until I switch off and on Wifi. Another example: I stream a movie from my iMac towards my iPhone 4, and suddenly streaming stops and I can't restart it until I switch off and on Wifi on my iPhone.
While the transmission broke down, the Wifi symbol still shows a perfect connection, in network settings I still have an IP-address, and even the router shows that the device is still connected, but not even a byte seems to be transmitted anymore until I stop and restart the Wifi connection on the affected device. And it does not seem to matter if the device is talking to servers in the internet or to machines in my local Wifi network. And: the iPhone with iOS4.2, the iMac running Snow Leopard, and even the Macbook Pro (that has these problems under Lion) running Windows 7 64 Bit do not show these symptoms.
I think the problem started with the end of daylight saving time here in germany (last sunday of October), but this may be a coincidence and does not necessarily have something to do with the problems.
What I tried to fix this (without any positive effect):
- Restart the router
- switch to another Wifi channel
- remove Wifi network settings under Lion and reconfigure them
- reset all network settings on the iOS devices
So this forum is the last hope I have to get this really annoying problem fixed.