RECORDING JUST STOPS ON IT'S OWN

When I record with the microphone, anytime that I open up any other window, the recording just stops immediately on it's own. Can someone please tell me what the purpose is for this?  I have scripts that I have to read for narrations and other productions, and I can't do it without being able to look at the text as I record in audition. These texts are .txt files.  So how do I change it so that audition keeps recording until I actually press stop?