Turning off automatic updates is always a good idea. Don't update to new versions of any software shortly before a gig.
Usually if there is serious bug discovered in a version, I will release a new update within a week. So if an update is at least a week old, you can be quite sure that this version is rock solid.
As a beta tester, if you install a beta version of Stage Traxx, it will never mess with the stable version. Both are installed in parallel and are treated as separate apps. So you can use the same device for testing new beta builds and also for your shows with the current stable version.