Question on using winedbg when program does not crash, just becomes unresponsive

[Susan Cragin]

There is some sort of memory leak in Dragon NaturallySpeaking that makes the program become unresponsive (but not crash) after some minutes of using the Dictation Box. 
I have tried winedbg, SetOnFirstBreak but the program never actually crashes. 
Without SOFB, of course, winedbg goes for the first unhandled exception, which is harmless. 
I can't start winedbg right before the program crashes, because I don't know when it will do so. It just sort of wears down. There is nothing I do to make it become unresponsive. 
Any ideas?