It's not clear to me what I could look at. You wrote about changing the settings on your router, and then changing the interface type, so it sounds like the issue is outside the Astaro.
If you can get a better idea of the problem, I could look at it in about 20 hours.
CHeers - Bob
Sophos UTM Community Moderator Sophos Certified Architect - UTM Sophos Certified Engineer - XG Gold Solution Partner since 2005