You can also nail the problem down by figuring out if it's wifi related or from your actual lines itself. If you're using wifi, try a hard-wire for a while if possible and see if the issue persists. If it doesn't, your pc is likely too far from the router, or there's some source of intermittent interference, which could be anything from unshielded power lines to old microwaves that don't have proper shielding creating EM fields that interfere.