Mac Book Air, when using iMovie shows Half of actual RAM

Hi All,
I have noticied multiple number of times that when I use my MBA and run iMovie for movie editing. it seems to loose half of the RAM in my case I am using :
- 1.3 Core i5
- 4 GB RAM
- OS X - 10.9.1
As soon as I start using iMovie and use it for sometime... I see the that fan comes on after sometime... and then the RAM halfs its self to 2GB. The total memory shown as well is 2 GB instead of 4GB. Is this a known problem ir yes what is the resolution to this problem.
Rohit S,
MBA Mid 2013

Reset PRAM.  http://support.apple.com/kb/PH4405
Try the suggestion in this article
http://support.apple.com/kb/TS1248
If this does not help, contact Apple.
Best.

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