MBP Display changes resolution to 800x600 after sleep

Weird situation... I usually just shut the cover of my MBP forcing sleep. If, for some reason my cursor is at the upper left corner, and I open the lid, the screen will go black for about 1 second, and the display has changed to 800x600. All I haver to do is reset the display in Preferences and all is ok again, until the next time. This does NOT happen every time I put the NBP to sleep - very arbitrary. I only have one hot corner assigned for Expose (lower right).
I'm current on OS and firmware.
Any ideas ???

Situation does not present itself anymore. Issue closed.

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MBP Display changes resolution to 800x600 after sleep

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