MacBook Pro :: Finder Keeps Logging Me Out

For the past 2 weeks, my Macbook Pro has been acting very strange. For full disclosure, I am running 10.6.8 on a 2008 MacBook Pro that is hooked up to a 30 -inch Cinema display.

First off, windows have been acting strange. If I click on the top bar of my web browser or application to drag the window to a new place, the image stays still, and then reloads from top to bottom as if it is refreshing. It them jumps to the place where my mouse then lands. This occurs very often.

Second, at least 3-4 times during my workday the entire screen turns blue, and appears to log me out. It then logs me back in and attempts to reopen all the programs I had open. This cycle takes about 25 seconds and is getting very annoying.

Lastly, my interface is a bit screwy now. Normally when I adjust the sound, a white speaker appears is the middle of the screen and shows the new volume level. Now, the speaker is a splotchy purple color and has relocated to the very bottom of my screen. Also, all the colors in my dock are warped. I attached a screenshot to this post.