I have had my desktop that has ran Ubuntu over a few years, on my most recent reinstall, periodically (saying once every 10 minutes or so) my system will just freeze. Mouse won't move, keyboard doesn't respond, Flash video is paused (the audio usually continues though). How do I go about handling this?
The only changes since my last install: I had a new graphics card (ATI Radeon 5450 1GB, a huge upgrade from my Radeon 3450 256 MB), and upgraded Ubuntu from 10.10 to 11.04. This in no way should be it hanging due to hardware constraints, the graphics card is sufficient for 3 monitors (through eyefinity), I only use about 3 of 6 GB of ram at a time, and processing stays under 25% (I have a little applet, I can watch it all the time).
How do I start debugging this and any ideas on a particular problem?