Some strange behavior in Cross fire

1. After my laptop hibernate and waken up, entering a game always create slow graphics, the movement became harsh and incontinuous (I think the fps changed), and the even the fire rate of my rifle changed.
2. When I entered a game that is about to end (or in ending, I am not sure), it takes extra long time, even the result is slow to come up after loading game result.
3. Recently I get higher chance of disconnected from server. Game freeze for some unknown reason because my web browser still work.