I've been adding temp tracks to a 40 minute project recently. A combination of WMA/MP3/WAV files.
After reading a lot of other topics on this forum (While waiting for this project to load) I have since converted all of them (Outside of PP) to .wav and replaced the other tracks with .wav files. -- while it doesn't crash as OFTEN it still does.
I consistently have crashing issues as I'm scrubbing through the timeline, especially if I attempt to cut the sound file, or to adjust it's levels.