Route calculation error & Route calculation takes for ages

I have a Garmin Forerunner 965 and have been having problems with the routing functionality for a few months now.

When I load a route on the watch and start the navigation, it takes a very long for the route to load (5-10 minutes). Although the route is not long (about 10 km). When I leave the route, I get an error message that there are no routable roads or paths. After that the Navigation stops. This happens both in the forest and in the city. It doesn't matter whether I load a route from Garmin Connect or create my own. The map (TopoActive Europe is up to date (version 2024.10).

If I navigate to a destination on the watch, the watch can automatically update the route if I leave the original path.

This is totally annoying and I can't use pre-planned routes. Do you have any idea what I can do?