It may be that you are reaching a stack overflow with too many automations executing on a single thread. This happens when you have logic with forloops or too many jumps. I recommend trying to find a location in the loop to add an asynchronous execution link. I usually do this at the beginning of the forloop or at the end of the forloop logic.
To make a link asynchronous, just right-click the yellow connection link and choose 'Asynchronous'.
Test again and see if that resolves your issue. If it doesn't, attach a screenshot of where you made the change.