why the F%(_@ im loosing my xp all the time
sometimes it works but too much often i exit the session when others player choosing a map, then everything is fine, but when i reenter the next server everything is lost
what about that what the hell is going on?

It's a known bug and many people are experiencing it, hold out for a fix buddy

its annoying
be scared of playing too long on one server in case of loosing all the xp
i have advice for crytek (of course in great respect, and listening to me carefully) make something like a save or "update profile" option, when the map will end in main option when we are choosing the map we have something like 40sec, every one could update profile, make changes in it.
its very easy and that should be for good when im choosing "update profile" its gonna update. simple

lol yeah - I have been promoted to lvl 10 five times now

(always play on ranked servers)