yojimbo

Hiya, new member here, and I see there's lots of knowledgeable people on the forums so hopefully I'll be able to find the answer to my problem! Basically for the past couple days whenever I'm streaming videos or listening to music on youtube, or playing a game, I notice a glitch/jerk where everything freezes or skips for a fraction of a second. It's only started happening in the past couple days and I haven't installed anything new? Although it only happens for a fraction of a second, it's still very annoying! Anyway if anyone is able to help I'd very much appreciate it!