Can't open ride from Edge 840 on Forerunner 745 anymore.

Hi,

Since last month I noticed my training status on my Forerunner 745 is no longer accurate.

I checked the activity history on the watch, my rides are visible there, but I can't open the rides from last month, just nothing happens. 

I am able to open older rides from my Edge 840.

The training load in the Garmin Connect app and website are as expected. So it seems like the activities of the Edge are no longer compatible with the watch software.

Is this a bug in the latest software?

Anybody with the same problem and/or a fix?