Recently I've noticed a lag issue occurring at least once or twice a day, when I play a game. Sometimes I start my game up (Urban Terror) and I run into some FPS lag. Usually I get a steady 125 frames per second (which is the max FPS the game can take) but on these certain occasions my FPS is considerably lower in most places in maps in the game. After I see this issue I log off my PC and back in again, open up my game and it runs fine, no lag issues at all. Does anyone have any idea why my computer is causing me to lag on occasions?