What is really the issue? Your project is in trouble, you have a concern or a change request is coming your way. It can be tempting to describe a PRINCE2 Issue by the consequences it causes. Sometimes issues are named Project Delay, Extend Stage, Extension of Project, Higher Cost or similar. These are typically the consequence or a recommended decision of the issue, not the issue itself.
When looking at an issue we should ask ourselves "Why?" -
“Why will there be a project delay?”, "Why will the cost be higher?", and use the answer to phrase the Issue Title and Issue Description. Try to identify the root cause. This will make it easier for you to be precise on the issue and the impact, and it will be easier for stakeholders to understand.