Can windows media player stop by itself for any reason?

I was playing a series of about 50 videos on media player on windows 7 and I left home. I share this apartment with a roommate and she has a history of going through my room and leaving evidence on purppose when I'm gone. So I started locking my room's door a while ago but this happened today. Could it be just the computer or the videos having hiccups or did my roommate pick my lock and broke in?