Hello Rahul Reddy Kankanala,
Welcome to the MS Q&A platform.
Are you seeing this error on the debug pipelines or trigger pipelines?
If you see the error with Dataflow debug, the cluster has TTL, and if nothing is going on for a while, then the cluster will die.
For example: if copy activities are running before Dataflow and taking more time than TTL then you might see this error.
Please let me know if you have any further questions,