Do not expect this to be an issue with the resume function as the resume will not publish your app, rather it will spin up the node only. I think something went wrong with the model being deployed the last time and when you fix this and redeploy your app the app will run fine.
Dear Erwin 't,
Thank you for your comment. This phnomenon has happened with the ohter app too. And we were able to access the app until yesterday and I have not modify at all. So I am thinking that the mendix cloud side might have any issues, but do you have any idea to recover this phenomenon ?
As of now, I have created three apps. Then they are the below situation.
My app 1 -> 'Resuming app...' is shown continuously.
My app 2 -> 'Resuming app...' is shown continuously.
My app 3 -> The app is shown as expected.
Regards,