Release notes and doc links are always in a pinned head post of this category that describes the current revision and the availability of any hotfixes. This post is updated whenever I update Reactor or publish hotfixes.
Do any of your activities contain notifications? Are you editing notifications? Do you get a message before the restart, or does it just do it? You are the first to report this issue, and naturally, I eat my own dog food (I use Reactor myself) and have not observed this behavior (except for native-mode notifications, where it is expected).