Thanks for your response @AndyMenon , but this one is having enterprise license. We’ve figured out what was causing the issue, when too many activities are placed in one single .Xaml file and when there are nested Paralell loop system fails to manage the load as there are many services which exceeds available threads / CPUs / RAM and only solution right now is Invoking such CPU intensive activities (sequence) as separate workflow and enable Isolations so it runs of separate environment.
it is newly reported bug, UiPath is working on it to resolve that.
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