I also have exactly the same issue!

I outlined the issue I had here:
http://ubuntuforums.org/showthread.php?p=4584283#post4584283
And also found people with similar issues here:
http://ubuntuforums.org/showthread.php?t=702557

I have a Dell XPS M1710

To copy and paste details from my post:
1) Only ever happens when my wireless is on. I have an Intel 4965AGN card.
2) It is more likely to happen if the computer sits idle, especially if there 
is no internet connectivity. If I leave something running like IM, it tends to 
happen less.
3) Sometimes it happens during non-idle periods, i.e. like just now when all I 
was doing was writing this post in firefox.
4) Once a freeze occurs, only a hard reboot will save it
5) I have found that if I reboot, and then allow ubuntu to reload, and then 
reboot again, it is less likely to occur.
6) It is very random, sometimes it can not happen for 2 days, then it will 
happen 5 time during the day.
7) This will sound very strange, but it seems more likely to occur in the 
evening.... I don't know why that is.

Next time I have a crash, I will include the syslog, and syslog.0 files
if they will help.

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