Lost connection to server (1)

Game mode: [Online]
Problem: Connection lost
Region: EU

When i vonnect to my own private server (which worked fine pre-04-07-18) i get the connection lost after 30-120seconds. my sister is playing on it all day on her xbox without issues. i just reinstalled the game yesterday since it was broken due ti the last update.

i dont want to reinstall every 2 days.
restarting both xbox and conan seems to increase the length to about 3 -5 minutes of playtime…

Steps on how to reproduce issue: