Loading Every Single Mission 1St Time Causes Endless Loading Screen

[RG870]

Since U15 every single mission (!) I try to play for the first time (since the update) ends up in a nerverending loading screen forcing me to kick the .exe via Task Manager. After restarting the game I can join that same mission and "only" get the already known hanging loading screen for 5-20s before I finally can join the mission.

Could you PLEASE fix this as I'm not keen on kicking the .exe another ~240 times until it happened on all missions once? As the game just hangs forever in the loading screen and does not crash in a "controlled" way I have no error code to provide.