Recently installed 12.04 on a laptop, and it works great. The only issue I am having is that after turned on for a few hours (and perhaps idle), the system becomes unresponsive.
It will not start any program that has not been started before. For example, I can open up system settings, but cannot access a setting for the first time since startup.
Shut down does not do anything. DashHome works, but clicking on the icons that pop up does nothing.
I turned off sleep settings (using a SSD) and don't need the computer to go to sleep.
Previously had 11.04 installed on this machine with a different SSD, and did not have this problem.
How to diagnose if it is a hardware issue?
How to turn off all "sleep" settings to determine if that is the problem?
bash: /usr/bin/top: Input/output error. Perhaps the SSD has fallen asleep?