If your loading your game in Calais while connecting to the server then most likely you will get unrealible connection due to loading times or your pc struggling to render in all the players in that area.
Load into a different city and then try loading in Calais if it still kicks you then there can be multiple reasons.
Your internet connection is to slow therefore it won't like busy areas.
Your PC can't handle the area with 100+ people nearby for example.
Try using ethernet cable instead of wireless.
Hope this helps you and can't wait for a reply.
Kind Regards
Frank Hughes ??