I too have automatons related to motion sensors... And I may have even migrated one of those from Simple Automation app over to the Motion Lighting app on the day the hub started acting like this. I'm going to remove that Motion Lighting App and re-add the rule in Simple Automation to see if things change.
Additionally, since I'm not quite seeing the same issue you are (my entire hub becomes unresponsive and I can no longer log into the UI, from any interface, when it locks up), I'm going to begin assuming we don't have exactly the same issue. Just want to be clear on that. There is another forum thread I literally just found (My Hub keeps crashing, I don't have any custom apps) that sounds EXACTLY like the problem I'm having, so I'm going to start asking some questions there.
