Child Process stuck at start node

Hi,

I am trying to use Start Process Smart Service to initiate processes conditionally. It is a MNI. Sometimes the process runs without any issue, however, sometimes the child process that was started gets stuck at start node without any errors in the instance. Does anyone have an idea regarding this? Any help is appreciated.

Refer the flow below :-

1st PM - the smart service runs as an MNI, triggers multiple instances


MNI Confg:


Full view of this Process



2nd PM triggered from the aforementioned Smart service
It contains some script tasks, Write to Record, etc. After that it triggers another PM through Asynchronous Sub Process, let's call it Review Process - no MNI - single instance


Full view of this Process

 

3rd PM - Review Process:
It gets stuck at start node or script task node and does not move forward.

Thanks