Hi,
We have released an update today that fixes the "AcroTray has stopped working" issue. Please open Acrobat or Reader DC and visit Help > Check for updates to make sure you are on the latest patch.
Details about the release: https://helpx.adobe.com/acrobat/release-note/acrobat-dc-august-02-2016.html
Please let us know how it goes.
Thanks,
-ashu