Every second map is kicking me out of the game

Just hit maps and trying to do tier 1 waypoint and it feels like every other map I load up will kick me out to the login screen when I try to enter the portal. Even if I close the game and reopen when I log back in it will just kick me out again when I try to re-enter the map.

Edit -- I've done some more maps and realised this is just when I'm in a party. Also it is literally every second map from my experience so far

Me and my friend have this problem too