last weekend i was playing on FMR karkand, a day later the server isnt in my list. Its been like this for nearly a week now.. Any tips? :/

I myself have Experianced this same issue several times

the only way my Issue seems to be resolved ...while ingame up top there should be a pull down Menu that allows you to add that server to your Favorite List, do that and it will appear Green in your Favorite List.

The other way of adding it and it is always gone the next time i go to play on that server.

so far it's worked for me i Hope that will resolve your Issue as well.