UserAgent: Mozilla/5.0 (Macintosh; Intel Mac OS X 10_11_6) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/54.0.2840.98 Safari/537.36

Steps to reproduce the problem:
CURRENT BEHAVIOR
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We have a placement with GIF Creative. The GIF has 3 frames and stops on the final frame.
When resolving the TAG in a browser of a Placement, on first load it shows all 3 frames. On refresh, it loads only the last frame.
When opening the image directly (outside of the tag),on first load it shows all 3 frames. On refresh, it loads all 3 frames again.

HOW TO REPLICATE
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1) Review Tag via EasyTag - https://easy-tag.appspot.com/t/bRtzMlRd
1st Load: All 3 frames will show
Reload: Only last frame will show

2) Load GIF directly - https://s0.2mdn.net/5997424/BSSMA_Adex_BBOARD_980X250_SERIE_1.gif
1st Load: All 3 frames will show
Reload: All 3 frames will show

What is the expected behavior?
When reloading the TAG,  the creative should show all 3 frames and stop in the last one. When reload it again, it should show same behavior.

What went wrong?
GIF should loop.

Did this work before? N/A 

Does this work in other browsers? N/A

Chrome version: 54.0.2840.98  Channel: stable
OS Version: OS X 10.11.6
Flash Version: Shockwave Flash 23.0 r0

I work within Google gTech Ads team. All GIFs served through DCM do no loop on reload. Is there anything we can do to force this to happen?