Macbook air freezes in screen save mode (Mid 2011 model using Mountain Lion

My MacBook Air freezes during screen save mode & is completely unresponsive.  The only option is to press & hold the power button to force a power down then restart the laptop.  This issue is not intermittent but happens every time the laptop is in screen save mode for any length of time (+20 mins).
The laptop is a Mid 2011 model. 1.8 GHz i7, 250 GB solid state HD, 13" display with 4 GB RAM.  I updated to Mountain Lion latest version about 1 month ago.

Hi there. I'm not using any 3rd party screen saver software, only the standard Mountain Lion supplied stuff.
I did have to get the Genuis Guys to reset my SMC as my battery, fan & power lead were showing problems.  Those issues are now solved but this has persisted.
I am considering a reinstal of the OS system but that is a 1 hour download following by ?? hours of waiting for the program to restart.
I'll try using one of the other screen saver options to test that.
Thanks for that idea.

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