I'm having this same problem: Ubuntu 8.04 Beta (2.6.24-12-generic) using both 
Gnome and KDE4
I using a D-Link Pc-card (DWL-G630)... for me the problem does not depend on if 
i using an open access point (like www.fon.com) without any decryption or if I 
using WPA or WEP.

SYMPTOMS:
Random hanging leaving [Caps lock] and [Scroll lock] LED-blinking and the 
screen and mouse are frozen...
...only way out is to reboot by unplugging batteries and power adapter.

I previously used the same LapTop (Dell Latitude C810) with 7.10 without any 
problem...
Differences between my old 7.10 installation vs. my new 8.04 beta installation:
- With 7.10 i used wired-LAN, now with 8.04 beta i using WiFi-card

LEDS:
- Num_lock OFF
- Caps_lock BLINKING
- Scroll_lock BLINKING

HW:
- Dell Latitude C810 (1GHz, 512MB and build in 32Mb Nvidia graphics)
- D-Link DWL-G630 (pc-card Wifi adapter)
...I have run memory-check without any errors.

WHAT IS TRIGGING THIS SYSTEM TO FREEZE?:
I do not know! The last two times is happened was when I:
1. Only having a console running "sudo apt-get install kde4"
2. Only having FireFox 3 Beta 4 running with 6 tabs
...it might could have something to do with current workload of the PC or 
network??

-- 
Hardy beta - laptop randomly freezes with caps & scroll lock leds blinking
https://bugs.launchpad.net/bugs/205653
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