Dashboard is not updating any longer

I have installed HAOS on a VM and also added the first integrations (like e.g. OpenWeatherMap or LocalCalendar) successfully, but now I’m having a problem that I cannot solve.

My dashboard does not update any sensor data (including the time) any more.

When I’m looking at the logbook I can see datestamp entries every minute,
but it seems they are not reaching my dashboard.

I’ve already restarted HA and also the VM, but nothing solved the issue.
I also created a 2nd dashboard, but same problem there.
What else can I do to solve this problem?

I have solved my problem now but I still don’t know what it was.
These are the steps I’ve done.

I have removed the include statement of my template_sensors.yaml from configuration.yaml
After that, the dashboard was refreshing again but of course many data was missing.

Then I’ve added the include statement again
but removed the part in the included file that I have added today.
Now the dashboard was still refreshing and less data was missing.

I added the code from today step by step and was waiting when the dashboard will stop refreshing but even with the last peace of code it was still refreshing.

That’s why my problem is solved but I still don’t know why it was ever there.
Nevertheless I will follow this strategy again when the problem comes up again.