LocalDB 2012 don't release memory

Hi,
I have a application that use sqlServer 2008 and I decided to move to localDB 2012. The migration was easy and everything went well, except for one thing. LocalDB start a automatic instance to execute his request and don't seem to ever release the memory need by the request. By example, I execute a request that select around 1 000 000 rows from a remote sql Server database and copy it in my localDB database. I know it should took some memory, but what I want is that VS releases the memory once it is done. For now, the instance just keep on eating memory and after some times a "out of memory" is throw. To avoid this behavior, I have to close manually the instance.

So, how should I do to correct this problem ?
Thank you,
David

...