That was the problem, the servers were non existent in the server list. Since I used the /server command at one point in the past they were in the recent menu when right clicking the lightning bolt. Logging now works as expected...

I have retry enabled with 'Try next server in group' checked, if it happens to connect to a 'Random server' will that cause problem again? Or would that only happen if two server connected to a random server? Maybe it would be a good idea to remove the random server entries. Thanks.