We have experienced some tests getting hung/stalled/stuck (for searches ) during the execution of the ATHs.
The symptom is very different tests hold in every execution and the build doesn't finish.
After a lot of analysis, I've found out that it's because of the connection used for testing if Jenkins is ready not being closed.
This issue may impact a lot of people, a lot of tests with very different symptoms. If you have a test restarting Jenkins in your ATH test and your tests don't finish getting hung in very different tests, perhaps you are facing this issue.