Azure Spring Cloud application deployment Provisioning state failing

Question

Hello

I am deploying a Spring Boot application to Azure spring cloud created through the reference architecture Bicep scripts.
The application is created through CLI with configuration : --memory 512Mi --cpu 500m --runtime-version Java_11

Deployments are initially successful i.e. Provisioning state = "Succeeded", Discovery status = "UP", Status = "Running", Running instance = "1/1", Registration status = "1/1"

After an unknown period of time the Provisioning state changes to "Failed".
Once in the "Failed" state I cannot stop or restart and cannot execute deployments to the application - Error "Deployment entity is in Failed state"

To resolve I've deleted the entire application, recreated and redeployed but this does not resolve the issue long term.

Why would a "Succeeded" deployment change to provisioning state = "Failed" and how to resolve ?
Where would the cause be recorded ?

Thank you