Unity crashes after an hour of use

I have windows 7. I have Unity 5.3.2. I have a very small project started. After about an hour of use, Unity freezes. On me, but the last 2 times I had not saved losing my work and it is quite frustrating. Please help. @jaslrich26

Just save before it crash : your computer can crash perfectly when you absolutly don’t want it so do like everyone should do and save almost every five minutes. This is everythings I can tell you.