Task reassignment using Escalation flow

I am trying to reassign a task using Escalations tab in user input task. When i configure a reassignment based on the Timer Event it execute once, but didnt execute afterwards. Example, Task generates and assign to a group, Someone from group accept the task but dont perform any action. After given time in Timer Event the task will reassign to the original group. This is happening once but not next time.
Any idea, what i'm missing here?


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