During server disconnection my char somehow became signed up for RF, but since this it neither can get to RF or unsign from it (button “leave” doesn’t work). Can anybody help with this?
If I remember correctly, grouping up with someone will fix this bug, I am not 100% sure though.
You could also send an ingame petition but you will likely not get an answer in a month or so… so try grouping up with someone first 
Join a pvp minigame, you are stucked in quest or something. Joining in mini will fix it.