Premier Elements 13 stops responding on Mac

I am using Premier on a Mac desktop.  When I am adding text (which is all I do in the program really) it will suddenly stop  responding.  sometimes I will let it sit and see if it will come back but it doesn't.  Sometimes it completely loses the video that was there, keeping the audio and the text boxes that I added.  I am forced to use "force Quit" every time.  Then I reopen and it is there and fine.  Later it happens again.  Why is this happening and what can I do?