VO2 Max Graph missing since 26th October

This was posted in the Garmin Connect Mobile Windows forum. I'm going to assume you do not have a Windows Phone, as this platform and the associated GC app have been severely deprecated. Moving thread to the Android forum and merging with your other thread.

This also happens after a reset.
The watch then calculates the VO2 Max again only after a few days.
Have you possibly reset your watch?

• No, didn't reset my watch or do any other changes at all in the last weeks. I still believe it is a problem with the visualitaion of the data as the values are shown in the windows connect web application.

here are two more images from the app and watch

On the watch you don't have any new VO2 max values since Monday 25th which explains why you don't see any values in the graph on the web. The watch hasn't reported any new ones.

Have you seen any new VO2 max values on the watch in the summary pages that you see after each activity?

I think I found the issue. Since Tuesday I was travelling and only run on a treadmill in the hotel, which apperently doesn't seem to generate any VO2 max values. At least that is what I read out of the garmin support center. 

Today first run in the forest since 26th October and the VO2 max is back, so "problem" is solved.