Hi there, Wadey.
The error you've encountered with two of your invoices could be due to a cache buildup in your browser. Cache helps browsers load frequently visited pages more quickly by storing data, but it can lead to issues if it accumulates too much.
With this, I recommend starting with some troubleshooting by clearing your browser cache and Intuit-specific cookies.
If the issue persists, consider using a different web browser. This will help determine if the problem is specific to the browser you're currently using.
Please let me know if you have any further questions.