When using solidworks RAM keeps building up

I have Solidworks 2014, I have 24GB of RAM and the most up to date graphics card that solidworks needs to run. When I am using the program every command I do it slowly stacks up on the RAM memory to the point those 24GB are being used and my computer can't run solidworks anymore. It is worst when I try to do a motion study. Is there something else they I need to look at or change? Thanks!

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