I have used AddThis Slider for months now and since then, there is no problem. However, I checked it today and it becomes erratic. I don't know it it's because the wordpress update or browser or whatsoever.
So here's the thing. When I scroll down to an article post, the slider will show when I'm near at the buttom. When I goes up, it disappear. That's normal!
However, when I go down again at the same page, then the problem arises. It open and closes as if it is flickering. I can't explain it further. You can check on my site and see for yourself.
Make sure to go down, go up then go down again.