Freezing on EC2

Hi Folks,

I recently installed node-red on an Amazon EC2 instance. I have a flow which about a 15 nodes and have been testing it successfully. Howver it stops working seemingly randomly and the UI is no longer available. The logging is set to the default and nothing unusual is showing up in the console just prior to the "crash".

Can you suggest any debugging methods that would help me to further track down the source of the problem?

Thanks