Ubuntu account suddenly keeps quitting on 11.04

I have been running Ubuntu on my Dell Vostro 1520 for a few months, and the latest 11.04 version of Ubuntu since it was released.

As of a few hours ago, my account keeps quitting every couple of minutes. The OS is still running, but I am returned to the login screen, and when I log in, no applications or documents are open.

Is there a standard procedure I should follow to troubleshoot this?

When it quits I typically have Gedit, Google Chrome and the Terminal open, with a few tabs in Terminal running rails server, rails console, etc.

Many thanks.


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