Investigate "Route Expiry"

[kauri-hero]

During meeting today, @bertllll mentioned there is a possibility that our current routing engine has a "route expiry" where the Node (ProxyServer) will decide to stop using a specific route.
It then asks the routing engine autonomously for an updated route

Important to investigate this immediately with @dnwiebe and @czarte so we can distinguish how this could effect in-use routes and the new country_code selection feature