I haven't had this problem before, but today editing videos Ive crashed around twenty times. The file size at the moment is 190MB, about 32 layers panels in groups and six audio tracks. So its nothing huge.
Ive done a check of my hardware, and it says its all healthy i4770CPU and Ive got about 27Gig ram unused in Win8.1. Ive upped the ram available to Photoshop and upped the cache levels in the photoshop settings.