The connection to the server was closed for unknown reasons. Perhaps ‘yunohost-api’ is unavailable?

What type of hardware are you using: VPS bought online
What YunoHost version are you running: 12.1.27
How are you able to access your server: The webadmin
SSH

Describe your issue

I have a strange problem. As soon as I open the data backup, a message briefly appears saying that the server / api is unavailable. However after a short lag, it is then displayed anyway. It seems to be a bug. Maybe any solution?

Greetz
Billy

Share relevant logs or error messages