My laptop's served me well for several years, but lately I've been curious about something. I've noticed sometimes, chiefly on YouTube, it sounds like whatever I'm listening to skips fairly often. This seems to happen even on videos which haven't seemed to skip before, yet I haven't noticed it when playing media like iTunes. Is this a potential hardware issue that's just associated with age, or is there something specific with YT's format that might be causing it?