@swvalenti MMM-Carousel seems to be the culprit. Will have to look at this modules behaviour.

@sdetweil I am using netatmo-module, which stops updating its data sooner or later. I used MMM-auto-refresh to reload the page and get the netatmo module updating again.

It looks like there are new forks to this original netatmo-module, so maybe I could try if they are more stable, and page refresh is not needed anymore.