When I just logged, I can see my DH's Damage (in Inventory screen) is increased from 4K to 8K. I have no idea why until I noticed that my "Critical Hit Chance" is increased from 0% to 100%, then my Damage is more than double ('cos my Critical Hit Damage is 113%). And then after dozen hits, I found "Critical Hit Chance" is dropped to 0% and increased steadily to 100% again.
What exactly it means to my actual hit? What's the mechanism behind?