I just tried the Syndicate server which is patched to the current beta.
I can confirm that FFB drops out whenever I pulled the trigger in the bf109. As per this thread.
http://forum.1cpublishing.eu/showthread.php?t=24021
This hadn't happened to me in single player. FFB does drop out occasionally in single player but comes back. I sometimes get that the stick flexes when firing in single player mode but in multiplayer FFB just drops out. Pull some G's it comes back again, fire it and you lose it again.