problem with laptop that no one can figure out

my friend has a hp laptop that he got about one year ago. It has a pretty low-end Nvidia mx110 but even with the simplest of games, randomly, games will freeze for a second; this happens every minute or so. stutter is also common. many people have looked into this and no one was able to figure out the problem. this is a problem since both the freezes and stuttering did not happen when he got the computer, its only been happening for the last two months