My 2011 MBP locks up after upgrading to Mountain Lion.

Happens with all types of apps at unpredictable times. I have the Free Memory app that shows the amount of free RAM.  I usually operate around 5ishGB free with two profiles open but for no apparent reason, things start bogging down and the free RAM drops all the way down to 20ishMB.   Any suggestions?  If I can't fix it soon, I want to go back to Lion.  How do I do that?

Happens with all types of apps at unpredictable times. I have the Free Memory app that shows the amount of free RAM.  I usually operate around 5ishGB free with two profiles open but for no apparent reason, things start bogging down and the free RAM drops all the way down to 20ishMB.   Any suggestions?  If I can't fix it soon, I want to go back to Lion.  How do I do that?

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