I got disconnected at the end of an stf. That horrible 'disconnected from server' message. Tried to log out and in, as this is the only way to restore the connection. Got 'account server connection could not be started' message. I had to restart the client.
Needless to say I did not get the reward. Thank you, developers. Thank you.
edit - still got 1 hour cooldown for the same stf, though.