MBP 13" - Going to Sleep when moved

I have a new 13" MBP and I noticed last week that it just went to sleep when I lifted it off my lap and placed it on the table.
I was downloading an update at the time and also using iSquint to convert some video clips for my iPod so the machine was warm but hardly over stressed.
I tried to recreate this a few times afterwards and it seemed to work everytime I moved the MBP. I disable the Sudden Motion Sensor - cured it. Re-enabled the sensor and it seemed to stay cured until last night when I was doing the same thing again (Mac OS and Safari updates and iSquint).
It's not like these are particularly sudden movements that would be causing this.
Are they supposed to sleep if they get too hot? Could it just be overheating?
EDIT: I should just mention that since this has happened it's also become very unreliable with sleeping. It goes to sleep when it shouldn't and when I try to wake it I get a blank screen. Seems I have to open and close the lid a few times to get the screensaver logon box to appear again.
Message was edited by: Steven Taylor3

Try resetting your SMC for your specific model according to:
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MBP 13" - Going to Sleep when moved

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