I have a flow that reads an XML file and loops every record to update a list based on some conditions. It is being run daily. 2 days ago it started to fail. The error was encountered internal server error, so I thought it was an one off issue, maybe server was down. But today it failed again, same message.
Normally I will go to the step that failed to find out more and troubleshoot the issue. But now the steps are greyed out and I can't expand it. What are the possible issues that will cause this 'internal server error' message?

Thank you.