Short description of your issue:

Images iterate unexpectedly rapidly when I use amp-carousel autoslide

How do we reproduce the issue?

1. Open a website that is using amp-carousel with autoslide
   https://www.google.co.jp/amp/s/www.hotpepper.jp/strJ000003128/amp/?client=safari

What browsers are affected?

Safari on iOS 10.3 beta 2

Which AMP version is affected?

Version 1487358851767

I've uploaded a video capture of the issue below.
https://youtu.be/_kxfs8duGMw