First things first, open a terminal and type
Originally Posted by MaZaMo
That does not sound like a kernel issue, although it could possibly be.
sudo apt-get install pastebinit
Next time it freezes - while it is still frozen - press the caps lock key. Does the Caps lock led toggle ?
Maybe the logs have some clues.
After it returns from being frozen (do this as soon as possible after the freeze) , open a terminal and
tail -n 150 /var/log/syslog | pastebinit
Post back both URLs display on the command line back into your next post.
tail -n 150 /var/log/Xorg.0.log | pastebinit
During the freezes, what is your CPU usage ? Disk IO usage ?
You can check with top and iotop. You may have to install iotop.
Keep them running in a terminal while using the PC.
sudo apt-get install iotop