I have this error message, could you please tell me what happens?

Sometimes i receive, this error message: "Error de conexión web" which means "Web connection error"

https://i.ibb.co/MDYs7tb/Captura-de-pantalla-de-2020-01-22-10-55-27.png

If you get it straight away - it's a problem. If you get it after a minute or later - it just means that you haven't received any data from your devices for some time.

Thanks Anton!, how can i hide that window?, when i open the browser console (F12), it show me an error from line 463 to 467 from the "app.min.js" file.

It's a toast that hides automatically.