Salesforce Error ID: 1754641886-14897 (-116268379)

We receive the above error when a flow is trying to execute. The flow name is "Insert Portfolio Manager as Loan Team member", being called by the Process "Loan - Insert Portfolio Manager as Loan Team Member". The process and flow work well when they are triggered by a an action done by a regular user, but it seems to fail when an automated process triggers the Process and the flow is called 12 or more times in succession. Is this the problem? Can a flow not be called so many times one after the other .....

Flow Details
Flow Name: Loan_Insert_Portfolio_Manager_as_Loan_Team_Member
Type: Record Change Process
Version: 2
Status: Active
Flow Interview Details
Interview Label: Loan_Insert_Portfolio_Manager_as_Loan_Team_Member-1_InterviewLabel
Current User: nCino Data (00536000001wmLe)
Start time: 3/12/2018 8:02 AM
Duration: 4 seconds
How the Interview Started
nCino Data (00536000001wmLe) started the flow interview.
Some of this flow's variables were set when the interview started.
myVariable_old = a0i3600000ILQ3RAAX
myVariable_current = a0i3600000ILQ3RAAX
ASSIGNMENT: myVariable_waitStartTimeAssignment
{!myVariable_waitStartTimeVariable} Equals {!Flow.CurrentDateTime}
Result
{!myVariable_waitStartTimeVariable} = "3/12/2018 8:02 AM"
DECISION: myDecision
Executed this outcome: myRule_1
Outcome conditions: and
1. {!formula_myRule_1} (true) Equals true
Logic: All conditions must be true (AND)
INSERT_PORTFOLIO_MANAGER_AS_LOAN_TEAM_MEMBER (FLOWS): myRule_1_A1
Inputs:
PortfolioManagerName = {!myVariable_current.PortfolioManager__c} (a3W36000000KPeZEAW)
LoanID = {!myVariable_current.X18_Digit_Salesforce_ID__c} (a0i3600000ILQ3RAAX)
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Error Occurred: An error occurred when executing a flow interview. 
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