Battlefield4: Sudden sluggish graphics after a while

Hi,

Wondering if anyone faces this problem like I do. Sometimes after playing BF4 for a few rounds, my graphics will suddenly become extremely sluggish and lag. And I'm force to quit the game. If I choose to play on, I may not even be able to alt-tab to close the game and have to force reboot.

I'm using:

i5-4590 3.30Ghz
MSI GeForce GTX 570 card
8GB Ram

Please advise if you encounter this before.