Yes, running the batch file commands continuously in the background and then on disconnect try and see if the traceroute changed at the same time (scroll through the traceroutes and see if the last few ones are the same or not).
Very interesting, but this network route instability will indeed disconnect EVE. If your connection starts in MUC, when it changes to FRA then the stateful network equipment in FRA will have no details of you and needs to reset the connection.
We have learned that Deutsche Telekom doesn’t have any direct peering with Cloudflare. This issue is then more likely with Deutsche Telekom as they switch between different routes to Cloudflare (hopping across the networks of different companies that have direct peering) or with the carrier(s) that Deutsche Telekom uses.
Furthermore, we have seen these types of issues before and they can be resolved but can only be resolved by the ISP, which is Deutsche Telekom in this case. First and foremost because they control their network routes but also because they are paying their carriers and therefore have contractual leverage.