I am using the official release Precise with kernel 3.2.0-23 x64
which i upgraded few days ago from 11.10
upon booting,the wireless connection connects normally  but there is no 
internet/network (i can't even ping the router) connection. I tried to switch 
off/on the wireless device, i tried disconnecting/connecting from Network 
manager with no luck.
rmmod iwlwifi and modprobe iwlwifi back again solves the issue.   
I'm seeing an error in dmesg:
[  103.018296] iwlwifi 0000:02:00.0: Microcode SW error detected.  Restarting 
0x2000000.
attached the dmesg output of the error dump
sherif@sherif-laptop:~$ lsb_release -a
No LSB modules are available.
Distributor ID: Ubuntu
Description:    Ubuntu 12.04 LTS
Release:        12.04
Codename:       precise
sherif@sherif-laptop:~$ uname -a
Linux sherif-laptop 3.2.0-23-generic #36-Ubuntu SMP Tue Apr 10 20:39:51 UTC 
2012 x86_64 x86_64 x86_64 GNU/Linux


** Attachment added: "dmesg output with iwlwifi error dump"
   
https://bugs.launchpad.net/ubuntu/+source/linux/+bug/911059/+attachment/3123665/+files/iwlwifi_dmesg.log

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https://bugs.launchpad.net/bugs/911059

Title:
  Intel wireless randomly drops connection

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