Scenario:
You may see the alias 'systemauto@catchpoint.com' deactivate tests in the changelog without manual intervention or any user making changes to the test properties
Explanation: 'systemauto@catchpoint.com' alias represents systemauto which is an account that is used for top-level admin work such as the background jobs for scheduled cleanup activity.
In a scenario where you might see 'systemauto@catchpoint.com' in the changelog / deactivate some tests, then Catchpoint has a job that deactivates tests when they are past their end time. When you set up a new test, you are asked to specify a Start time and End time. It is this end time the job considers.
NOTE: This functionality does not delete tests or objects.