Been having an issue with an app's datasource. The app works fine, but sometimes when I edit the app, I get errors that values are not available. If I refresh the datasource, the errors go away. Has anyone else seen or experienced this?

Been having an issue with an app's datasource. The app works fine, but sometimes when I edit the app, I get errors that values are not available. If I refresh the datasource, the errors go away. Has anyone else seen or experienced this?
Could you share more detail with your issue?
Which type of field could be unavailable? Could you share some screenshots?
Could you try to add Refresh('data source') at the OnVisible property of the screen?
As another alterative workaround, you could add collect your SP list to collection at OnStart of App, and take collection as the data source of the field.
If this doesn't make sense, please let me know.
Best regards.
Sik