Random crashes and I'm running latest version + good spec

[spiritsavage]

Hey! I'm on 4.0.1 and I have bad but my friend is running 4.0.1 with good specs. It keeps crashing on both of ours. Is there a way to fix this? Also, my system runs about a 40%-50% average speed. Are my specs really that bad or am I doing something wrong? Any help would be appreciated! Thanks!