I am currently using Ubuntu 12.04 and for the second time in a week, Ubuntu freezes completely, becoming entirely unresponsive. The only way to use it again is to turn off the power to reboot.
Both times the same thing happened. All of the sudden, the wireless connection to the Internet is lost, ubuntu keeps trying to connect and asks for password and some seconds later then it freezes.
I don't understand why the wireless connection fails, since it works fine after I reboot PC and I am close enough to router, I never had wireless problem on Windows 7 for example.
This is a serious issue because I have no chance of saving work.
Any ideas on why this is happening?